[英]Unable to upload Image to database due to Base64 error
我正在关注有关如何将图像上传到数据库然后进行检索的教程。 我的WCF服务运行正常,它具有将数据插入数据库的功能,如下所示:
public bool CreateTeam(string userId, string teamId, string name, string coach, byte[] photo)
{
string query = "INSERT INTO t" + userId + "(Id, Name, Coach, Photo) VALUES (@id, @name, @coach, @photo)";
try
{
SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["TeamsConnectionString"].ConnectionString);
SqlCommand command = new SqlCommand(query, connection);
connection.Open();
command.Parameters.AddWithValue("@id", teamId);
command.Parameters.AddWithValue("@name", name);
command.Parameters.AddWithValue("@coach", coach);
command.Parameters.AddWithValue("@photo", photo);
command.ExecuteNonQuery();
connection.Close();
return true;
}
catch (Exception ex)
{
Console.WriteLine("" + ex.Message);
return false;
}
}
在我的控制器中,我有一个对WCF服务的引用和一个HttpPostedFileBase
来获取上传的文件,如下所示:
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(Team team)
{
if (ModelState.IsValid)
{
HttpPostedFileBase photo = Request.Files["Photo"];
TeamsService.ServiceClient client = new TeamsService.ServiceClient();
client.Open();
if (client.CreateTeam(Session["DynamixSessionId"].ToString(), team.Id, team.Name, team.Coach, ConvertToBytes(photo)))
{
client.Close();
return RedirectToAction("Index", "Teams");
}
else
{
return View();
}
}
return View();
}
下面概述了ConvertToBytes
函数:
public byte[] ConvertToBytes(HttpPostedFileBase file)
{
byte[] fileBytes = null;
BinaryReader reader = new BinaryReader(file.InputStream);
fileBytes = reader.ReadBytes((int)file.ContentLength);
return fileBytes;
}
我的Team
模型是这样的:
[Key]
[Required(AllowEmptyStrings = false, ErrorMessage = "This cannot be empty")]
public string Id { get; set; }
[Required(AllowEmptyStrings = false, ErrorMessage = "This cannot be empty")]
public string Name { get; set; }
[Required(AllowEmptyStrings = false, ErrorMessage = "This cannot be empty")]
public string Coach { get; set; }
public byte[] Photo { get; set; }
public HttpPostedFileBase File { get; set; }
在我的视图中,我有一个带有enctype
属性的表单,如下所示:
@using (Html.BeginForm("Create", "Teams", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
<div class="form-group">
@Html.LabelFor(model => model.Id, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.Id, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.Id, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Name, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.Name, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.Name, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Coach, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.Coach, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.Coach, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
<input type="file" name="Photo" id="Photo" />
</div>
</div>
}
当我单击提交按钮时,其他字段将正确插入,并且可以从我的SQL Server数据库中看到它们。 一旦添加我的Photo
域(类型为varbinary
),就会出现以下错误:
输入内容不是有效的Base-64字符串,因为它包含非Base 64字符,两个以上的填充字符或填充字符中的非法字符。
为什么会出现此错误? 关于如何解决错误的任何建议?
我的建议是您应该指定参数类型。 commandd.Parameters.Add("@photo", SqlDbType.VarBinary, LengthOfFieldOnTheServerSide).Value = photo;
这个建议是基于我之前对SQL查询的“打架”。 对我来说,它正在使用system.byte []
代替参数byte []
的实际值来创建查询。
抱歉打错我在手机上使用StackExchange应用程序
为什么您的文件上传控件使用模型中“ Photo
字段的ID? “ Photo
字段必须为HttpPostedFileBase
类型,以便正确上传图像并避免Base64
错误。 我建议您进行以下更改:
在模型中 ,添加以下内容:
public HttpPostedFileBase UploadedPhoto { get; set; }
在您的视图中 ,添加以下内容:
<input type="file" name="UploadedPhoto" id="UploadedPhoto" />
在您的控制器中 ,添加以下内容:
HttpPostedFileBase photo = Request.Files["UploadedPhoto"]; TeamsService.ServiceClient client = new TeamsService.ServiceClient(); client.Open(); if (client.CreateTeam(Session["DynamixSessionId"].ToString(), team.Id, team.Name, team.Coach, ConvertToBytes(photo))) { client.Close(); return RedirectToAction("Index", "Teams"); } else { return View(); }
那应该解决您的问题。
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