通过 jQuery AJAX 将字符串数组传递给 C# WebMethod

Posted 2023-02-22

【中文标题】通过 jQuery AJAX 将字符串数组传递给 C# WebMethod

【英文标题】：pass string array via jQuery AJAX to C# WebMethod

【发布时间】：2015-06-28 19:11:23

【问题描述】：

我想通过 jQuery (POST) 将 javascript 字符串数组传递给 C# WebMethod：

$.ajax(
    type: "POST", // GET or POST or PUT or DELETE verb          
    url: PageURL + 'ChangeColor', // Location of the service
    data: " 'OriginalColorHex': '" + JSON.stringify(clipartOriginalColorsHex) + "','ModifiedColorHex':'" + JSON.stringify(clipartModifiedColorsHex) +
          "','OriginalColorRGB': '" + JSON.stringify(clipartOriginalColorsRGB) + "','ModifiedColorRGB':'" + JSON.stringify(clipartModifiedColorsRGB) +
          "','fileName':'" + clipartFileName + "' ",
    contentType: "application/json; charset=utf-8", // Content type sent to server
    dataType: "json", // Expected data format from server
    processdata: true, // True or False      
    traditional: true,          
    success: function (result)  // On Successful service call
        console.log(result);
    
);   

ajax 调用中的数据如下所示

 'OriginalColorHex': '["#000000","#006565","#cccc99"]', 'ModifiedColorHex': '["#3366CC","#cc5500","#3366cc"]', 'OriginalColorRGB': '["rgb(0,0,0)","rgb(0,101,101)","rgb(204,204,153)"]', 'ModifiedColorRGB': '["rgb(51, 102, 204)","rgb(204, 85, 0)","rgb(51, 102, 204)"]', 'fileName': '179.svg' 

C#网络方法：

[WebMethod]
public static string ChangeClipartColor(string[] OriginalColorHex, string[] ModifiedColorHex, string[] OriginalColorRGB, string[] ModifiedColorRGB, string fileName)

    // Code Here

错误

   "Message":"Cannot convert object of type \u0027System.String\u0027 to type \u0027System.String[]\u0027",
   "StackTrace":"   at System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeInternal(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object\u0026 convertedObject)\r\n   at System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeMain(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object\u0026 convertedObject)\r\n   at System.Web.Script.Services.WebServiceMethodData.StrongTypeParameters(IDictionary`2 rawParams)\r\n   at System.Web.Script.Services.WebServiceMethodData.CallMethodFromRawParams(Object target, IDictionary`2 parameters)\r\n   at System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext context, WebServiceMethodData methodData, IDictionary`2 rawParams)\r\n   at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)",
   "ExceptionType":"System.InvalidOperationException"

【参考方案1】：

快速修复

JSON 数组不需要用引号引起来。这是有效的 JSON：

    "OriginalColorHex": [
        "#000000",
        "#006565",
        "#cccc99"
    ]

尝试使用JSONLint 之类的工具验证您的 JSON，以确保其有效。 WebMethod 应该能够接受字符串数组就好了。

稍微好一点的方法

与其将 JSON 构建为字符串，不如构建一个对象，然后让 JavaScript 为您处理转换：

var clipartOriginalColorsHex = ['#000000','#006565','#cccc99'];
var clipartModifiedColorsHex = ['#3366CC','#cc5500','#3366cc'];
var clipartOriginalColorsRGB = ['rgb(0,0,0)','rgb(0,101,101)','rgb(204,204,153)'];
var clipartModifiedColorsRGB = ['rgb(51, 102, 204)','rgb(204, 85, 0)','rgb(51, 102, 204)'];
var fileName = '179.svg';

var myData = 
    OriginalColorHex: clipartOriginalColorsHex,
    ModifiedColorHex: clipartModifiedColorsHex,
    OriginalColorRGB: clipartOriginalColorsRGB,
    ModifiedColorRGB: clipartModifiedColorsRGB,
    fileName: fileName
;

$.ajax(
    type: "POST",       //GET or POST or PUT or DELETE verb          
    url: PageURL + 'ChangeColor',       // Location of the service
    data:   JSON.stringify(myData),
    contentType: "application/json; charset=utf-8",     // content type sent to server
    dataType: "json",   //Expected data format from server
    processdata: true,  //True or False      
    traditional: true,          
    success: function (result) //On Successful service call
        console.log(result);
    
);

更简洁，更不容易出错，更容易测试。这是一个fiddle 来演示。

【参考方案2】：

因为值不是数组。删除看起来像数组的字符串周围的引号。

 'OriginalColorHex': ["#000000","#006565","#cccc99"],'ModifiedColorHex':["#3366CC","#cc5500","#3366cc"],'OriginalColorRGB': ["rgb(0,0,0)","rgb(0,101,101)","rgb(204,204,153)"],'ModifiedColorRGB':["rgb(51, 102, 204)","rgb(204, 85, 0)","rgb(51, 102, 204)"],'fileName':'179.svg' 

【参考方案3】：

您正在将字符串 ('["#000000","#006565","#cccc99"]') 传递给字符串[]。摆脱阵列周围的单引号。应该这样做：

$.ajax(
type: "POST",       //GET or POST or PUT or DELETE verb          
url: PageURL + 'ChangeColor',       // Location of the service
data:   " 'OriginalColorHex': " + JSON.stringify(clipartOriginalColorsHex) + ",'ModifiedColorHex':" + JSON.stringify(clipartModifiedColorsHex) +
        ",'OriginalColorRGB': " + JSON.stringify(clipartOriginalColorsRGB) + ",'ModifiedColorRGB':" + JSON.stringify(clipartModifiedColorsRGB) +
        ",'fileName':" + clipartFileName + " ",
contentType: "application/json; charset=utf-8",     // content type sent to server
dataType: "json",   //Expected data format from server
processdata: true,  //True or False      
traditional: true,          
success: function (result) //On Successful service call
    console.log(result);

);

【参考方案4】：

您可以等待将所有数据放在一起后对数据进行字符串化，从而让您的生活更轻松。

var data = 
    OriginalColorHex: clipartOriginalColorsHex,
    ModifiedColorHex: clipartModifiedColorsHex,
    OriginalColorRGB: clipartOriginalColorsRGB,
    ModifiedColorRGB: clipartModifiedColorsRGB,
    fileName: clipartFileName
;

$.ajax(
    type: "POST", // GET or POST or PUT or DELETE verb          
    url: PageURL + 'ChangeColor', // Location of the service
    data: JSON.stringify(data),
    contentType: "application/json; charset=utf-8", // content type sent to server
    dataType: "json", // Expected data format from server
    processdata: true, // True or False      
    traditional: true,          
    success: function (result)  // On Successful service call
        console.log(result);
    
);