使用jQuery调用ASP.net Web服务时出错

Question

I'm attempting to call an ASP webservice using jQuery with a complex object as an input.

Here is my jQuery fn:

    request: function (url, method, data) {
        var json = JSON.stringify(data);
        return $.ajax({
            url: url,
            type: method,
            data: json,
            error: ErrorHelpers.printErrorToConsole,
            dataType: 'json',
            contentType: 'application/json',
            processData: false
        });
    }

the json being passed in looks like this:

{
    "search": {
        "WarehouseId": "",
        "AuctionId": "",
        "Barcode": "",
        "Name": "",
        "CategoryId": "",
        "Description": "",
        "ManufacturerId": "",
        "StatusId": "",
        "StatusOperator": "",
        "HasPhoto": "",
        "DateReceived": "",
        "SellerAdministrativeArea": "",
        "SellerId": "",
        "IsApproved": "",
        "Keyword": "",
        "SortBy": "",
        "RowStart": "",
        "RowLimit": "10"
    }
}

and my web method definition is as follows:

    [WebMethod(EnableSession = true)]
    [ScriptMethod(UseHttpGet = true)]
    public List<ClientInventory> GetInventory(string search)
    { //code
    }

Does anyone know why it's erroring out? Here is the response I get:

{"Message":"Invalid web service call, missing value for parameter: \'search\'.","StackTrace":" at System.Web.Script.Services.WebServiceMethodData.CallMethod(Object target, IDictionary 2 parameters)\\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"}

Answer 1

You should create a class...

public class Search
{
    public string WarehouseId { get; set; }
    public string AuctionId { get; set; }
    public string Barcode { get; set; }
    public string Name { get; set; }
    public string CategoryId { get; set; }
    public string Description { get; set; }
    public string ManufacturerId { get; set; }
    public string StatusId { get; set; }
    public string StatusOperator { get; set; }
    public string HasPhoto { get; set; }
    public string DateReceived { get; set; }
    public string SellerAdministrativeArea { get; set; }
    public string SellerId { get; set; }
    public string IsApproved { get; set; }
    public string Keyword { get; set; }
    public string SortBy { get; set; }
    public string RowStart { get; set; }
    public string RowLimit { get; set; }
}

and modify your method like this...

[WebMethod(EnableSession = true)]
    [ScriptMethod(UseHttpGet = true)]
    public List<ClientInventory> GetInventory(Search search)
    { //code
    }

Also, check the method you are using here...

type: method,

It suggests in the error that you're using a Post ?

Answer 2

It turns out that you shouldn't use JSON.stringify() when you're sending GET requests. Changing the app to send/receive POST requests solved the problem.

The method signature now looks like this:

    [WebMethod(EnableSession = true)]
    //[ScriptMethod(UseHttpGet = true)]
    public List<ClientInventory> GetInventory(Search search)
    {}

and the request fn in the js is now passing the method as a "POST".