Knockout.js和复选框列表：发布到mvc控制器

Question

我有一个MVC视图模型，如下所示：

public class DirectorySearchModel
{
    [Display(Name = "First name contains")]
    public string FirstName { get; set; }

    [Display(Name = "Last name contains")]
    public string LastName { get; set; }

    public CountriesCollection Countries { get; set; }
    public IEnumerable<Country> SelectedCountries { get; set; }
    public IEnumerable<Country> AllCountries { get; set; }
}

CountriesCollection对象（第9行）如下所示：

public class CountriesCollection
{
    [Display(Name = "Countries")]
    public int[] arrCountries { get; set; }
}

现在，我正在创建一个新的，空白的CountriesCollection实例，然后将其添加到DirectorySearchModel视图模型的空白实例中，然后将其全部序列化为Knockout.js的javascript视图模型：

{
"FirstName":null,

"LastName":null,

"Countries":{"arrCountries":[]},

"SelectedCountries":[{"RelationshipManager":{},"CountryId":1,"CountryName":"UK"},{"RelationshipManager":{},"CountryId":2,"CountryName":"France"},{"RelationshipManager":{},"CountryId":3,"CountryName":"Spain"}],

"AllCountries":[{"RelationshipManager":{},"CountryId":1,"CountryName":"UK"},{"RelationshipManager":{},"CountryId":2,"CountryName":"France"},{"RelationshipManager":{},"CountryId":3,"CountryName":"Spain"}]
}

我的复选框呈现为： <input checked="checked" data-bind="checked: Countries.arrCountries" id="Countries_arrCountries30" name="Countries.arrCountries" type="checkbox" value="1"> 。 检查一对夫妇意味着你最终得到这个Knockout.js视图模型：

{
"FirstName":null,

"LastName":null,

"Countries":{"arrCountries":["1", "3"]},

"SelectedCountries":[{"RelationshipManager":{},"CountryId":1,"CountryName":"UK"},{"RelationshipManager":{},"CountryId":2,"CountryName":"France"},{"RelationshipManager":{},"CountryId":3,"CountryName":"Spain"}],

"AllCountries":[{"RelationshipManager":{},"CountryId":1,"CountryName":"UK"},{"RelationshipManager":{},"CountryId":2,"CountryName":"France"},{"RelationshipManager":{},"CountryId":3,"CountryName":"Spain"}]
}

正常提交我的视图（即通过提交按钮而不是Knockout.js）到一个需要DirectorySearchModel的MVC操作，我可以请求model.Countries.arrCountries获取已检查项目的列表，但是当我使用...

$.post("/MyController/MyAction", ko.toJS(viewModel), function(returnData) {
    $("#resultCount").html(returnData);
});

要么...

$.post("/MyController/MyAction", viewModel, function(returnData) {
    $("#resultCount").html(returnData);
});

对于需要相同DirectorySearchModel另一个动作， model.Countries.arrCountries始终为null ！ 我想知道是否由于Knockout.js在MVC期待int[] string[] s时将arrCountries条目发布为string[] s，但是将我的MVC代码更改为期望string[] s似乎没有太大改变......！ DirectorySearchModel中的CountriesCollection对象似乎存在，但是其中的arrCountries始终为null 。

有任何想法吗？ 任何帮助非常感谢！

编辑

接收Knockout.js viewModel的操作：

public MvcHtmlString ResultCount(DirectorySearchModel model)
{
    return new MvcHtmlString(getResultCount(model).ToString());
}

getResultCount方法：

public int getResultCount(DirectorySearchModel model)
{
    IUserRepository userRepository = new UserRepository();
    int count = userRepository.Search(model, null).Count();
    return count;
}

固定！

感谢Konstantin指出从$ .post到$ .ajax的简单切换将我的Knockout.js视图模型发送回我的mvc动作就是所有需要的！ 这是我正在使用的$ .ajax代码：

$.ajax({  
    type: "POST",
    url: "/MyController/MyAction",
    data: ko.toJSON(viewModel),
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function (data) {
        $("#resultCount").html(data);
    }
});

Answer 1

你不能使用$ .post你需要去底层$ .ajax并添加正确的contenttype以使mvc接受发布的json并进行模型绑定（contenttype应为“application / json; charset = utf-8”）google对于它，你会有很多例子