asp.net-mvc – ASP.NET mvc 4控制器参数始终为空时发送json到控

解决问题的方法如下：

> contentType应该是application / json(如上面提到的Ant P)
> json数据应该是JSONString3 = {“Name”：“monday”}的形式(如上所述Ant P)
>发送给控制器之前,json应该被字符串化如下：JSONString3 = JSON.stringify(JSONString3)(如Quan建议)

客户端javascript

function getChart() {
               JSONString3 = { "Name" : "monday" };
               jQuery.ajaxSettings.traditional = true;
                $.ajax({
                    url: "@Url.Action("getChart",contentType: 'application/json',data: JSON.stringify(JSONString3),success: function (data) {
                        var imagestring = btoa(data);
                        $('#ChartImage').attr('src'," + imagestring + "?" + new       Date().getTime());
                    }
                })
                jQuery.ajaxSettings.traditional = false;
    }

MVC控制器

[Authorize]
[HttpPost]
public ActionResult getChart(YAxis HAxis)
{
    YAxis XAxisvalue = HAxis;
    Charts chart = new Charts();
    MemoryStream ms = new MemoryStream();
    chart.Chart.SaveImage(ms);
    string image = Convert.ToBase64String(ms.GetBuffer());
    return File(ms.GetBuffer(),"Chart.png");
}

模型

public class YAxis
{
    public string Name { get; set; }
}

而不是这样：

JSONString3 = { "Name" : "monday" };

我们做得到：

var JSONString3 = {};
JSONString.Name = "monday";

但是我们还需要在发布给控制器之前对对象进行字符串化

To pass multiple objects to controller,below is the example

客户端javascript

function getChart() {

        //first json object
        //note: each object Property name must be the same as it is in the Models classes on    server side
        Category = {};
        Category.Name = "Category1";
        Category.Values = [];
        Category.Values[0] = "CategoryValue1";
        Category.Values[1] = "CategoryValue2";

        //second json object
        XAxis = {};
        XAxis.Name = "XAxis1";
        XAxis.Values = [];
        XAxis.Values[0] = "XAxisValue1";
        XAxis.Values[1] = "XAxisValue2";

        //third json object
        YAxis = {};
        YAxis.Name = "YAxis1";

        //convert all three objects to string
        //note: each object name should be the same as the controller parameter is!!
        var StringToPost = JSON.stringify({CategoryObject : Category,XAxisObject : XAxis,YAxisObject : YAxis});

        $.ajax({
            url: "@Url.Action("getChart",contentType: "application/json",data: StringToPost,success: function (data) {
                var imagestring = btoa(data);
                $('#ChartImage').html(data);
            }
        })
    }

MVC控制器

[HttpPost]
public ActionResult getChart(Category CategoryObject,XAxis XAxisObject,YAxis YAxisObject)
{
    //do some stuff with objects here and return something to client
    return PartialView("_Chart");
}

类别模型

public class Category
{
    public string Name { get; set; }
    public List<string> Values { get; set; }
}

XAxis模型

public class XAxis
{
    public string Name { get; set; }
    public List<string> Values { get; set; }
}

YAX模型

public class YAxis
{
    public string Name { get; set; }
}

希望能帮助人澄清整个画面！