ASP.NET MVC核心Web POST请求使用NULL值填充数据模型

Question

情境

我正在建立一个博客，并正在配置一个页面以将编辑后的评论发布到MsSql服务器。

问题

在我提交提交表单POST之后，通过我的视图，应该通过此表单捕获并返回的属性值都全部返回为“ NULL”！ 由于我的数据模型中存在NULL值，最终将导致异常错误。 在浏览完整个应用程序并使用Fiddler之后，我无法诊断问题。

快速视觉示例

在提交POST （在运行时）并且我的应用程序到达博客的Home Controller之后，这就是显示和可用的内容。

注意：如您所见，每个输入的值在运行时由Home Controller捕获。 但是，此数据不会在POST传输到EditComment方法。

处理

输入控件使用我的模型的属性值填充，然后提交：

EditComments.cs

    @model MpComment

    ... HTML Content ...

    <form asp-controller="Home" asp-action="EditComment" method="post" class="text-danger input-form">
        <div asp-validation-summary="ModelOnly"></div>
        <div class="form-group">
            <label asp-for="<Model.Property>" class="control-label"></label>
            <input asp-for="<Model.Property>" class="form-control" />
            <span asp-validation-for="<Model.Property>" class="text-danger"></span>
        </div>

        ... ASP Form Input Elements...

        <div class="form-group input-submit">
            <input type="submit" value="Submit" class="btn material-button" />
        </div>
    </form>

我的AppDbContext已初始化

AppDbContext.cs

namespace Portfolio.Data
{
    public class AppDbContext : IdentityDbContext
    {
        public AppDbContext(DbContextOptions<AppDbContext> options) : base(options) { }

        public virtual DbSet<MpPost> MpPost { get; set; }
        public virtual DbSet<MpComment> MpComment { get; set; }
        public virtual DbSet<MpGuest> MpGuest { get; set; }
        public virtual DbSet<MpLogin> MpLogin { get; set; }
        public virtual DbSet<MpProject> MpProject { get; set; }
    }
}

我的MpComments模型开始看起来像遍历并设置每个属性值，但是，填充每个属性的数据为NULL。

    using System;
    using System.ComponentModel.DataAnnotations;

    namespace Portfolio.Models
    {
        public partial class MpComment
        {
            public int Id { get; set; }
            public int Mp_Post_Id { get; set; }
            public int Mp_Guest_Id { get; set; }
            public string Comment { get; set; }
            public int? Karma { get; set; }
            public int? Approved { get; set; }
            public string Ip { get; set; }
            public string Agent { get; set; }
            public DateTime? Create { get; set; } = DateTime.Now;
            public DateTime? Update { get; set; } = DateTime.Now;
        }
    }

一旦没有填充任何东西，就启动家庭控制器，并调用以下函数：

HomeController.cs

    [HttpPost]
    public async Task<IActionResult> EditComment(MpComment comment)
    {
        comment.Id = 0;

        _repo.AddComment(comment);

        if (await _repo.SaveChangesAsync())
            return RedirectToAction("ViewComments");
        else
            return View(comment);
    }

此时，从POST填充的comment参数变量仅包含NULL值，如下所示：

调查与分析

视觉工作室

局部变量检查器

    Agent        null
    Approved     null
    Comment      null
    Create       {6/30/2019 1:04:29 PM}
    Id           0
    Ip           null
    Karma        null
    Mp_Guest_Id  0
    Mp_Post_Id   0
    Update       {6/30/2019 1:04:29 PM}

此过程可以在其他设置成完全相同的功能的过程上按预期工作，只是在不同的表上！

例如，这是Fiddler通过几乎相同的POST过程在成功的POST上捕获的内容：

提琴手督察

原始（EditProject的成功）

    POST https://localhost:44390/Home/EditProject/21 HTTP/1.1
    Host: localhost:44390
    Connection: keep-alive
    Content-Length: 555
    Cache-Control: max-age=0
    Origin: https://localhost:44390
    Upgrade-Insecure-Requests: 1
    Content-Type: application/x-www-form-urlencoded
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36
    Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
    Referer: https://localhost:44390/Home/EditProject/21
    Accept-Encoding: gzip, deflate, br
    Accept-Language: en-US,en;q=0.9,mt;q=0.8
    Cookie: .AspNetCore.Antiforgery.x5eNnYCJ5UA=CfDJ8OfA6sTjcU1PuqxxzGM-oMrl1aZfFqqMphsPHMioPYeJIj8tRRSXB1N9Pm7JhspsKDyUKawAVJYkSlP56myEU4qcRohQ1axrDWFXPVvZjlNZqiRZAZVOMcZ3wupV12M_z289E7MaUrZ1nbOzH34eiH0; .AspNetCore.Identity.Application=CfDJ8OfA6sTjcU1PuqxxzGM-oMp2YqORrHzf5IL0rLJ8jvAP-RYvHIXeH63EfD3-TugdZGBP9nf_lHhAn71ACsIQZe_cJ1x7u3FBh25uhlXZIJX9yk7ZdH_GuwfYEe-Zaa1CSAD2f2g8U7syt8jvxy18c-qCN9Yq2zLQpBeOlzftudcaMKKrsA-UGO8BOHLPTk1TYe1QMosDGaFDLXY0POqCpluxiiA0qsA0i9iQeAP6HL7ZC8lLjf76Lf_E5usVyakwa9X3ELDJQeaEFFa5Vi_5063xCHhm3NRREE5loUCff1rKmaOKvvOR-Fnf-QtYLG-MGthgVAGah4cdXjD0jsKFBM0Ny-Yt8uRddQ26w_8AUJqhRo9jOAXEuzyhYwPRfKQKykgpy-4lVIZXc2QR25EWxq9H6zh5GGCTIitxISDcpoHf0mUqzT9aJKo_LwB6cibzbDwBmVsTc6Yn6cQA0MMoBVa6E6hKuvQoNerU7psX5z2D2k8tB8mZVlJQ3medeMwHQonOSBh99OxOrBO5K6iedlpPqSNco8r7PbNcHCdhLKehtoyJkE3tzmrv_EOTAS7ldXNhhPHqNp_RmuAdGWlsJ-a-bN5itj1hv_o7RCxl8t49XB9oddsg4iOvR-BUZOLuxJKfQ90PAH4S9BvblwLKoXx3Gt3We5WeG8Ga6rAXHQhd

    Id=0&Title=Product+Engineer&Desc=nulla+neque+libero+convallis+eget+eleifend&Live_Url=bloglovin.com%2Feget%2Ftincidunt%2Feget.jpg&Github_Repo=sourceforge.net%2Fet%2Fultrices%2Fposuere%2Fcubilia.jpg&Bitbucket_Repo=creativecommons.org%2Fpede%2Flibero%2Fquis.html&Create=2011-07-11T00%3A00%3A00.000&Update=2019-06-20T00%3A00%3A00.000&__RequestVerificationToken=CfDJ8OfA6sTjcU1PuqxxzGM-oMqTHmlRblU70EY0Ou7tH2IifiXdJOCtMRepfMg-GhKz-j4at6h9BOzJTNjHIROMjDpUiOqxvDeGWcja8K-uGkYrW8DX58j9mIFlwKML9tLVtvusmGmPekVMPxYqRkKdcyLGb6qpav3upDLAvfxLblbs9RynCyG4bDTAAZ4jzxc-ww

提琴手督察

原始（EditComments失败）

    POST https://localhost:44390/Home/EditComment/1 HTTP/1.1
    Host: localhost:44390
    Connection: keep-alive
    Content-Length: 606
    Cache-Control: max-age=0
    Origin: https://localhost:44390
    Upgrade-Insecure-Requests: 1
    Content-Type: application/x-www-form-urlencoded
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36
    Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
    Referer: https://localhost:44390/Home/EditComment/1
    Accept-Encoding: gzip, deflate, br
    Accept-Language: en-US,en;q=0.9,mt;q=0.8
    Cookie: .AspNetCore.Antiforgery.x5eNnYCJ5UA=CfDJ8OfA6sTjcU1PuqxxzGM-oMrl1aZfFqqMphsPHMioPYeJIj8tRRSXB1N9Pm7JhspsKDyUKawAVJYkSlP56myEU4qcRohQ1axrDWFXPVvZjlNZqiRZAZVOMcZ3wupV12M_z289E7MaUrZ1nbOzH34eiH0; .AspNetCore.Identity.Application=CfDJ8OfA6sTjcU1PuqxxzGM-oMp2YqORrHzf5IL0rLJ8jvAP-RYvHIXeH63EfD3-TugdZGBP9nf_lHhAn71ACsIQZe_cJ1x7u3FBh25uhlXZIJX9yk7ZdH_GuwfYEe-Zaa1CSAD2f2g8U7syt8jvxy18c-qCN9Yq2zLQpBeOlzftudcaMKKrsA-UGO8BOHLPTk1TYe1QMosDGaFDLXY0POqCpluxiiA0qsA0i9iQeAP6HL7ZC8lLjf76Lf_E5usVyakwa9X3ELDJQeaEFFa5Vi_5063xCHhm3NRREE5loUCff1rKmaOKvvOR-Fnf-QtYLG-MGthgVAGah4cdXjD0jsKFBM0Ny-Yt8uRddQ26w_8AUJqhRo9jOAXEuzyhYwPRfKQKykgpy-4lVIZXc2QR25EWxq9H6zh5GGCTIitxISDcpoHf0mUqzT9aJKo_LwB6cibzbDwBmVsTc6Yn6cQA0MMoBVa6E6hKuvQoNerU7psX5z2D2k8tB8mZVlJQ3medeMwHQonOSBh99OxOrBO5K6iedlpPqSNco8r7PbNcHCdhLKehtoyJkE3tzmrv_EOTAS7ldXNhhPHqNp_RmuAdGWlsJ-a-bN5itj1hv_o7RCxl8t49XB9oddsg4iOvR-BUZOLuxJKfQ90PAH4S9BvblwLKoXx3Gt3We5WeG8Ga6rAXHQhd

    Mp_Post_Id=1&Mp_Guest_Id=1&Comment=lorem+quisque+ut+erat+curabitur+gravida+nisi+at+nibh+in+hac+habitasse+platea+dictumst+aliquam&Karma=1&Approved=1&Ip=21.99.31.96&Agent=Mozilla%2F5.0+%28Macintosh%3B+U%3B+Intel+Mac+OS+X+10_7%3B+en-us%29+AppleWebKit%2F533.4+%28KHTML%2C+like+Gecko%29+Version%2F4.1+Safari%2F533.4&Create=2018-07-17T00%3A00%3A00.000&Update=2012-06-01T00%3A00%3A00.000&__RequestVerificationToken=CfDJ8OfA6sTjcU1PuqxxzGM-oMquggjJDBhMvQwfCKwHRJS9tJeBi-4bT19jJVjuUjZgYE1LD4BvCF2LBJlQ45u3d9sEGmm-l9EAhbXaA2TwuNjW4xhYpVXl4Z0YE_YBEvbuSzodxjP8v1GoYAXYfs5yl3L39SK0gp1YKkkwujMhdExO17v3n-b_y4IhhZJ3SanIZw

注意：除POST URL有所不同外，其他所有内容（应该出现的地方）都相同。 每次对此进行故障排除时，我都会输入第一个条目，对其进行编辑，然后提交。 每次执行此操作时（在其他四个可以正常工作的过程中），它都会迭代到下一个条目； 如上所示。

示例： A）当有20个项目条目时，编辑并提交项目1 ：

POST https://localhost:44390/Home/EditProject/21 <=== discrepancy

B）当有20条评论条目时，编辑并提交评论1 ：

POST https://localhost:44390/Home/EditComment/1 <=== discrepancy

Chrome（网络标题）

成功（项目）

General:
    Request URL: https://localhost:44390/Home/EditProject/66
    Request Method: POST
    Status Code: 302
    Remote Address: [::1]:44390
    Referrer Policy: no-referrer-when-downgrade
---------------------------------------------------------------------------------------------------
Response Headers:
    content-length: 0
    date: Mon, 01 Jul 2019 00:04:16 GMT
    location: /Home/ViewProjects
    server: Kestrel
    status: 302
    x-powered-by: ASP.NET
    x-sourcefiles: =?UTF-8?B?QzpcV29ya3NwYWNlXHd3d1xhc3BcUG9ydGZvbGlvXFBvcnRmb2xpb1xIb21lXEVkaXRQcm9qZWN0XDY2?=
---------------------------------------------------------------------------------------------------
Request Headers:
    :authority: localhost:44390
    :method: POST
    :path: /Home/EditProject/66
    :scheme: https
    accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
    accept-encoding: gzip, deflate, br
    accept-language: en-US,en;q=0.9,mt;q=0.8
    cache-control: max-age=0
    content-length: 1200
    content-type: application/x-www-form-urlencoded
    cookie: .AspNetCore.Antiforgery.x5eNnYCJ5UA=CfDJ8OfA6sTjcU1PuqxxzGM-oMrl1aZfFqqMphsPHMioPYeJIj8tRRSXB1N9Pm7JhspsKDyUKawAVJYkSlP56myEU4qcRohQ1axrDWFXPVvZjlNZqiRZAZVOMcZ3wupV12M_z289E7MaUrZ1nbOzH34eiH0; .AspNetCore.Identity.Application=CfDJ8OfA6sTjcU1PuqxxzGM-oMpTJYFjUyUy3eLO3fbnX9V4SSq14P_h_AlTAyZs-9LrMW9QOzTP46d8CJetHqzamw-ulm6IbjGyC_hElFiwtJRbKAV3GuVlGQeNfbhcJ7M81EH4bqnbi-NBwP4nmlXROTG3DvMYdHqC1-eqT53ip4mnHpdLDLKlwX80Lk8uWPpiyD5L_RFiMGl5i0vOUz19bbn-mSC3IVbuGz8LeDePfKDmU-3b8_sNiZJpBpx4p6jORrds69LkpkdZX2NUWzyevM4TWw8irVRRBY0PAFKkkZEfQy52kPFfHLZgcZ2JMFo2iQ0DqRcq7nqwnU1JRbNTHEQ56WOsStWn7IGfBqA43B5QdLn-yWTiP5AIalG3kv_o-6VZTmyfu6QbBCbwD_7gpjewoB8IiYn86WaTVbvkryGBJZMjSEq5M2H1m365zI392lNZVzwDADwF04s4zYmHx8snkk9Z3NUAjvzDJo9b1IJNNIKnPmERysOR73W_hAfZdpVN0Ltx2fT7-13g4ow-2Xizi_t2b4SQcX6tC_tlju224eh0KkKNxOJ3irBQRsWAT9iKe_aaE7usFUkZgfR9vuZnPO62qzuxUwROsX3-Tz4lSxSD2N4ajqpEpVMcS528hMO5lXQwMA2RpGBKpR2JJzsN1KdbYgPcB16Ad14VgJNJ
    origin: https://localhost:44390
    referer: https://localhost:44390/Home/EditProject/66
    upgrade-insecure-requests: 1
    user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36
---------------------------------------------------------------------------------------------------
Form Data:
    Title: Product Engineer
    Desc: nulla neque libero convallis eget eleifend
    Content: sodales scelerisque mauris sit amet eros suspendisse accumsan tortor quis turpis sed ante vivamus tortor duis mattis egestas metus aenean fermentum donec ut mauris eget massa tempor convallis nulla neque libero convallis eget eleifend luctus ultricies eu nibh quisque id justo sit amet sapien dignissim vestibulum vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia curae nulla dapibus dolor vel est donec odio justo sollicitudin ut suscipit a feugiat et eros vestibulum ac est lacinia nisi venenatis tristique fusce congue diam id ornare
    Project_Image: http://dummyimage.com/193x141.jpg/ff4444/ffffff
    Live_Url: bloglovin.com/eget/tincidunt/eget.jpg
    Github_Repo: sourceforge.net/et/ultrices/posuere/cubilia.jpg
    Bitbucket_Repo: creativecommons.org/pede/libero/quis.html
    Create: 2011-07-11T00:00:00.000
    Update: 2019-06-20T00:00:00.000
    __RequestVerificationToken: CfDJ8OfA6sTjcU1PuqxxzGM-oMq4kGmbGOLj875J5O8hQlwLIYQR7YHYe58lgzEyN5Wat3viIjRuF80IPiwf_iRYUydAC0vfWv-q5jvLA_bAsdz7blAbvNoT4TxTYqZ5ONf5Q2bYqOyWlhdoN7ZduEaRc3dEBua_8F35F6mNuq0NFfLTDkvlCvO1da4dbhsWg49nsg
---------------------------------------------------------------------------------------------------

失败（评论）

General:
    Request URL: https://localhost:44390/Home/EditComment/20
    Request Method: POST
    Status Code: 500
    Remote Address: [::1]:44390
    Referrer Policy: no-referrer-when-downgrade
---------------------------------------------------------------------------------------------------
Response Headers:
    content-type: text/html; charset=utf-8
    date: Sun, 30 Jun 2019 23:40:23 GMT
    server: Kestrel
    status: 500
    x-powered-by: ASP.NET
    x-sourcefiles: =?UTF-8?B?QzpcV29ya3NwYWNlXHd3d1xhc3BcUG9ydGZvbGlvXFBvcnRmb2xpb1xIb21lXEVkaXRDb21tZW50XDIw?=
---------------------------------------------------------------------------------------------------
Request Headers:
    :authority: localhost:44390
    :method: POST
    :path: /Home/EditComment/20
    :scheme: https
    accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
    accept-encoding: gzip, deflate, br
    accept-language: en-US,en;q=0.9,mt;q=0.8
    cache-control: max-age=0
    content-length: 558
    content-type: application/x-www-form-urlencoded
    cookie: .AspNetCore.Antiforgery.x5eNnYCJ5UA=CfDJ8OfA6sTjcU1PuqxxzGM-oMrl1aZfFqqMphsPHMioPYeJIj8tRRSXB1N9Pm7JhspsKDyUKawAVJYkSlP56myEU4qcRohQ1axrDWFXPVvZjlNZqiRZAZVOMcZ3wupV12M_z289E7MaUrZ1nbOzH34eiH0; .AspNetCore.Identity.Application=CfDJ8OfA6sTjcU1PuqxxzGM-oMpTJYFjUyUy3eLO3fbnX9V4SSq14P_h_AlTAyZs-9LrMW9QOzTP46d8CJetHqzamw-ulm6IbjGyC_hElFiwtJRbKAV3GuVlGQeNfbhcJ7M81EH4bqnbi-NBwP4nmlXROTG3DvMYdHqC1-eqT53ip4mnHpdLDLKlwX80Lk8uWPpiyD5L_RFiMGl5i0vOUz19bbn-mSC3IVbuGz8LeDePfKDmU-3b8_sNiZJpBpx4p6jORrds69LkpkdZX2NUWzyevM4TWw8irVRRBY0PAFKkkZEfQy52kPFfHLZgcZ2JMFo2iQ0DqRcq7nqwnU1JRbNTHEQ56WOsStWn7IGfBqA43B5QdLn-yWTiP5AIalG3kv_o-6VZTmyfu6QbBCbwD_7gpjewoB8IiYn86WaTVbvkryGBJZMjSEq5M2H1m365zI392lNZVzwDADwF04s4zYmHx8snkk9Z3NUAjvzDJo9b1IJNNIKnPmERysOR73W_hAfZdpVN0Ltx2fT7-13g4ow-2Xizi_t2b4SQcX6tC_tlju224eh0KkKNxOJ3irBQRsWAT9iKe_aaE7usFUkZgfR9vuZnPO62qzuxUwROsX3-Tz4lSxSD2N4ajqpEpVMcS528hMO5lXQwMA2RpGBKpR2JJzsN1KdbYgPcB16Ad14VgJNJ
    origin: https://localhost:44390
    referer: https://localhost:44390/Home/EditComment/20
    upgrade-insecure-requests: 1
    user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36
---------------------------------------------------------------------------------------------------
Form Data:
    Mp_Post_Id: 20
    Mp_Guest_Id: 20
    Comment: etiam faucibus cursus urna ut tellus nulla ut erat id mauris vulputate elementum nullam varius nulla
    Karma: 6
    Approved: 0
    Ip: 142.146.130.50
    Agent: Mozilla/5.0 (Windows NT 5.1; rv:14.0) Gecko/20120405 Firefox/14.0a1
    Create: 2010-10-21T00:00:00.000
    Update: 2009-10-07T00:00:00.000
    __RequestVerificationToken: CfDJ8OfA6sTjcU1PuqxxzGM-oMpEiWlpyDJHiDaw7Rz0PI6fyiscJ9aAahlk0J2Coz5R42uB-L3LvBS94t5QxvcBZ2PwMUI9McLlFR1rtds9yh89UZSzHpR-q_SvbM1g4KCUYDhvNht_bMaoy9NJvMTfOCR_TPW4CKTMnJCR8OEJYahY9CWXY_GozMl1MMkL3MFkFQ
---------------------------------------------------------------------------------------------------

Wireshark（流量分析）

成功（编辑项目）

POST /Home/EditProject/2 HTTP/1.1
Cache-Control: max-age=0
Connection: Keep-Alive
Content-Type: application/x-www-form-urlencoded
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.9,mt;q=0.8
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Host: localhost:44390
Referer: https://localhost:44390/Home/EditProject/2
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MS-ASPNETCORE-TOKEN: 2a6aebc6-e154-4f02-9517-cae788a1069f
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Title=Senior+Quality+Engineer+IV&Desc=nascetur+ridiculus+mus+vivamus+vestibulum+sagittis+sapien+cum+sociis&Content=vivamus+tortor+duis+mattis+egestas+metus+aenean+fermentum+donec+ut+mauris+eget&Project_Image=http%3A%2F%2Fdummyimage.com%2F237x180.bmp%2F5fa2dd%2Fffffff&Live_Url=ihg.com%2Fgravida%2Fnisi%2Fat%2Fnibh.json&Github_Repo=paginegialle.it%2Fligula%2Fsuspendisse.xml&Bitbucket_Repo=harvard.edu%2Fcongue.aspx&Create=2018-09-07T00%3A00%3A00.000&Update=2013-05-17T00%3A00%3A00.000&__RequestVerificationToken=CfDJ8OfA6sTjcU1PuqxxzGM-oMqFkSNAgkReKvXjTW0EStR_OB4Zz6j90ZdieDNspaE86824rUys1Av2cI9mKtO15RaMnYSiz1_As63Ez0XWxX4N3zfL4vlgGfPQ43FMqqfcPBAG33xvi4G0naOTHEVTdGbiwkLrK2UVF2O01JzfVW3olYbxna45Pg10haFTI-s5QgHTTP/1.1 302 Found
Date: Mon, 01 Jul 2019 16:19:16 GMT
Server: Kestrel
Content-Length: 0
Location: /Home/ViewProjects

失败（编辑评论）

POST /Home/EditComment/1 HTTP/1.1
Cache-Control: max-age=0
Connection: Keep-Alive
Content-Type: application/x-www-form-urlencoded
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
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Referer: https://localhost:44390/Home/EditComment/1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36
origin: https://localhost:44390
upgrade-insecure-requests: 1
MS-ASPNETCORE-TOKEN: 2a6aebc6-e154-4f02-9517-cae788a1069f
X-Forwarded-For: [::1]:61219
X-Forwarded-Proto: https
Content-Length: 606

Mp_Post_Id=1&Mp_Guest_Id=1&Comment=lorem+quisque+ut+erat+curabitur+gravida+nisi+at+nibh+in+hac+habitasse+platea+dictumst+aliquam&Karma=1&Approved=1&Ip=21.99.31.96&Agent=Mozilla%2F5.0+%28Macintosh%3B+U%3B+Intel+Mac+OS+X+10_7%3B+en-us%29+AppleWebKit%2F533.4+%28KHTML%2C+like+Gecko%29+Version%2F4.1+Safari%2F533.4&Create=2018-07-17T00%3A00%3A00.000&Update=2012-06-01T00%3A00%3A00.000&__RequestVerificationToken=CfDJ8OfA6sTjcU1PuqxxzGM-oMr9nzkkEn5p6n7jwRflZ1bmxhEOVzWiW7VXO1rmDYbHQR4CvYlmqH4LyuHMPDsQZWXE-gZ3eDU2LWqJd1uVnMKeJcbV0gne1gxSQdeg2Cd7wklVGIJAlC4PNr5hbqJmAGItiemNRukLVKMLVZ0E65dR-pVhxKy4SteMmvnDVMg5_QHTTP/1.1 500 Internal Server Error
Date: Mon, 01 Jul 2019 17:06:52 GMT
Content-Type: text/html; charset=utf-8
Server: Kestrel
Transfer-Encoding: chunked

附加信息

项目配置

myProject.csproj

    <Project Sdk="Microsoft.NET.Sdk.Web">

      <PropertyGroup>
        <TargetFramework>netcoreapp2.1</TargetFramework>
      </PropertyGroup>

      <ItemGroup>
        <PackageReference Include="Microsoft.AspNetCore.App" Version="2.1.2" />
        <PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="2.1.2" PrivateAssets="All" />
        <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.1.9" />
        <PackageReference Include="MySql.data" Version="8.0.16" />
        <PackageReference Include="MySql.Data.EntityFrameworkCore" Version="8.0.16" />
      </ItemGroup>

      <ItemGroup>
        <Folder Include="Migrations\" />
      </ItemGroup>

    </Project>

数据库

[mpComment.sql]

    CREATE TABLE [mpComment]
    (
        [id]            INT             NOT NULL        PRIMARY KEY,
        [mp_post_id]    INT             NOT NULL        FOREIGN KEY REFERENCES mpPost(id),
        [mp_guest_id]   INT             NOT NULL        FOREIGN KEY REFERENCES mpGuest(id),
        [comment]       NVARCHAR(500)   NOT NULL,
        [karma]         INT             NULL,
        [approved]      INT             NOT NULL,
        [ip]            NVARCHAR(100)   NULL,
        [agent]         NVARCHAR(255)   NULL,
        [create]        DATETIME        NULL,
        [update]        DATETIME        NULL,
    )

插入查询

CommentsInsertQuery.sql

这将与（通常）通过上述表格提交的数据完全相同 ； 效果很好。

    INSERT INTO [profileDb].[dbo].[mpComment] ([mp_post_id], [mp_guest_id], [comment], [karma], [approved], [ip], [agent], [create], [update])
    VALUES (1, 1, 'lorem quisque ut erat curabitur gravida nisi at nibh in hac habitasse platea dictumst aliquam', 1, 1, '21.99.31.96', 'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_7; en-us) AppleWebKit/533.4 (KHTML, like Gecko) Version/4.1 Safari/533.4', '07/17/2018', '06/01/2012');

最后的想法

我担心这个问题可能发生在实体框架中的某个地方，无法解决。 如果我有一个真诚的起点，可以确定.Net框架捕获来自浏览器的数据的确切点，那么我也许可以更好地确定关键问题。

类似帖子：

ASP.NET CORE Web API：执行带有空Guid的HTTP Post请求时，模型值为空

该问题与替代问题非常相似，但是，故障排除似乎更少，并且有关此问题的信息也更少。 另外，在这个问题上没有太多的热爱，也没有提供解决方案。

预先感谢，并欢呼

Answer 1

https://docs.microsoft.com/zh-cn/aspnet/web-api/overview/formats-and-model-binding/parameter-binding-in-aspnet-web-api

public ValuesController : ApiController
{
     public HttpResponseMessage Post([FromUri] GeoPoint location) { ... }
}

在ASP.Net中，您应该使用FromUri。 它告诉解析器在URL中查找对象。 您还可以使用FromBody告诉解析器在请求正文中查找对象。

Answer 2

杰里索具解决方案

尽管我仍然不确定发生此错误的原因，但我仍然能够管理解决方法。

概要

感觉到回发数据是在应用程序（图形）中捕获的，但是，它没有填充EditComments方法的参数值，我只是手动填充了数据。

解

在我的Home Controller中包含了Microsoft.AspNetCore.Http库，并从以下method修改了以下回发method ：

HomeController.cs

    [HttpPost]
    public async Task<IActionResult> EditComment(MpComment comment)
    {
        comment.Id = 0;

        _repo.AddComment(comment);

        if (await _repo.SaveChangesAsync())
            return RedirectToAction("ViewComments");
        else
            return View(comment);
    }

至

HomeController.cs

    [HttpPost]
    public async Task<IActionResult> EditComment()
    {
        var form = Request.Form.ToList();

        var comment = new MpComment
        {
            Id          = 0,
            Mp_Post_Id  = Int32.Parse(form.Where(x => x.Key == "Mp_Post_Id").FirstOrDefault().Value),
            Mp_Guest_Id = Int32.Parse(form.Where(x => x.Key == "Mp_Guest_Id").FirstOrDefault().Value),
            Comment     = form.Where(x => x.Key == "Comment").FirstOrDefault().Value,
            Karma       = Int32.Parse(form.Where(x => x.Key == "Karma").FirstOrDefault().Value),
            Approved    = Int32.Parse(form.Where(x => x.Key == "Approved").FirstOrDefault().Value),
            Ip          = form.Where(x => x.Key == "Ip").FirstOrDefault().Value,
            Agent       = form.Where(x => x.Key == "Agent").FirstOrDefault().Value,
            Create      = Convert.ToDateTime(form.Where(x => x.Key == "Create").FirstOrDefault().Value),
            Update      = Convert.ToDateTime(form.Where(x => x.Key == "Update").FirstOrDefault().Value)
        };

        _repo.AddComment(comment);

        if (await _repo.SaveChangesAsync())
            return RedirectToAction("ViewComments");
        else
            return View(comment);
    }

...一切都按预期进行。

附加说明

这些值很容易检索，以防其他人遇到类似问题。 只需将请求表单数据转换为List （如上），然后通过输出控制台将这些结果打印出来。

例：

    [HttpPost]
    public methodExpectingPostback()
    {
        var form = Request.Form.ToList();

        foreach (var item in form)
        {
            Debug.WriteLine($"{item.Key} : {item.Value}");
        }
    }

ASP.NET MVC核心Web POST请求使用NULL值填充数据模型

问题描述

情境

问题

快速视觉示例

处理

调查与分析

视觉工作室

提琴手督察

提琴手督察

Chrome（网络标题）

Wireshark（流量分析）

附加信息

项目配置

数据库

插入查询

最后的想法

类似帖子：

2 个解决方案

解决方案1
0 2019-07-01 00:10:48

解决方案2
0 已采纳 2019-07-01 21:58:53

杰里索具解决方案

概要

解

附加说明

ASP.NET MVC核心Web POST请求使用NULL值填充数据模型

问题描述

情境

问题

快速视觉示例

处理

调查与分析

视觉工作室

提琴手督察

提琴手督察

Chrome（网络标题）

Wireshark（流量分析）

附加信息

项目配置

数据库

插入查询

最后的想法

类似帖子：

2 个解决方案

解决方案1 0 2019-07-01 00:10:48

解决方案2 0 已采纳 2019-07-01 21:58:53

杰里索具解决方案

概要

解

附加说明

解决方案1
0 2019-07-01 00:10:48

解决方案2
0 已采纳 2019-07-01 21:58:53