Question

我在使用Ajax和ASP.NET WebMethods

传递JSON对象时遇到问题

function setStudentInfo() {
    var jsonObjects = [
        { id: 1, name: "mike" },
        { id: 2, name: "kile" },
        { id: 3, name: "brian" },
        { id: 1, name: "tom" }
    ];

    $.ajax({
        type: "POST",
        url: "ConfigureManager.aspx/SetStudentInfo",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        async: false,
        data: { students: JSON.stringify(jsonObjects) },
        success: function (result) {
            alert('success');
        },
        error: function (result) {
            alert(result.responseText);
        }

    });
}

ASP.NET代码

[WebMethod]
public static void SetStudentInfo(object students)
{
     //Here I want to iterate the 4 objects and to print their name and id
}

我收到以下错误：

“{”消息“：”无效的JSON原语：学生。“，”StackTrace“：”在System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializePrimitiveObject（）在System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeInternal（Int32深度）在System.Web.Script.Serialization.JavaScriptObjectDeserializer.BasicDeserialize（String input，Int32 depthLimit，JavaScriptSerializer serializer） at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize（JavaScriptSerializer serializer，String input，Type type，Int32 depthLimit）在System.Web.Script.Serialization.JavaScriptSerializer.Deserialize [T]（字符串输入）在System.Web.Script.Services.RestHandler.GetRawParamsFromPostRequest（HttpContext上下文，JavaScriptSerializer序列化程序）在System.Web.Script.Services.RestHandler.GetRawParams（WebServiceMethodData methodData，HttpContext context）在System.Web.Script.Services.RestHandler.ExecuteWebServiceCall（HttpContext context，WebServiceMethodData methodData）“，”ExceptionType“：”System.ArgumentException“}”

Answer 1

将整个JSON作为字符串传递，如下所示：

data: '{variable: "value"}'

如果我尝试传递它，我总是会收到错误。

Answer 2

我知道这是一个古老的问题，但如果有人来这里寻求答案，那就是解决方案;

var jsonObjects=[
    { id: 1, name: "mike" },
    { id: 2, name: "kile" },
    { id: 3, name: "brian" },
    { id: 1, name: "tom" }
];

$.ajax({
    type: "POST",
    url: "ConfigureManager.aspx/SetStudentInfo",
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    async: false,
    data: JSON.stringify({ students: jsonObjects }),
    success: function (result) {
        alert('success');
    },
    error: function (result) {
        alert(result.responseText);
    }

});

Answer 3

您收到该错误是因为需要单个Object但您的代码需要一个对象列表。有时这可能有点棘手。为了使数据传输更容易，您应该创建一个类，其中包含要传递给WebMethod的对象类型的属性，因为ASP.NET似乎更容易解析它。例如：

public class Student
{
    private string _name;
    private int _id;
    public string name {
        get { return _name; }
        set { _name = value; }
    }
    public int id {
        get { return _id; }
        set { _id = value; }
    }
}

然后您的WebMethod将更改为接受学生类对象列表，如下所示：

[WebMethod]
public static void SetStudentInfo(List<Student> Students)
{
    foreach (Student s in Students)
    {
        //Do whatever here System.Console.WriteLine(s.name);
    }
}

然后您需要做的就是稍微改变您的Ajax调用：

function setStudentInfo() {
    var jsonObjects = [
        { id: 1, name: "mike" },
        { id: 2, name: "kile" },
        { id: 3, name: "brian" },
        { id: 1, name: "tom" }
    ];

    $.ajax({
        type: "POST",
        url: "ConfigureManager.aspx/SetStudentInfo",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        async: false,
        data: { Students: JSON.stringify(jsonObjects) },
        success: function (result) {
            alert('success');
        },
        error: function (result) {
            alert(result.responseText);
        }

    });
}

Answer 4

试试这段代码：

function setStudentInfo() {

var jsonObjects = {"students" : [
    { id: 1, name: "mike" },
    { id: 2, name: "kile" },
    { id: 3, name: "brian" },
    { id: 1, name: "tom" }
]};

$.ajax({
    type: "POST",
    url: "ConfigureManager.aspx/SetStudentInfo",
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    async: false,
    data: JSON.stringify(jsonObjects),
    success: function (result) {
        alert('success');
    },
    error: function (result) {
        alert(result.responseText);
    }

});

}

Answer 5

你实际上并没有将json发送到服务器，发送json只是为数据属性传递一个json字符串。

data: JSON.stringify(jsonObjects),

如何使用ASP.NET WebMethod使用Ajax传递JSON对象

5 个答案: