如何使用jQuery调用带有参数的asp.net asmx Web服务以获取响应

Question

我编写了一个简单的ASMX Web服务，其中提供了一种从数据库中获取一些价值的方法。 我的服务代码是：

[WebMethod]
public string GetProductStock(string productId, string TerminalId, string CCPId)         
{
    ProductsDomain objProduct = new ProductsDomain();
    objProduct.Product_Id = Convert.ToInt32(productId);
    objProduct.TerminalId = Convert.ToInt32(TerminalId);
    objProduct.CCPId = Convert.ToInt32(CCPId);
    DataTable dt = objProduct.GetProductDetail();
    if (dt.Rows.Count > 0)
    {
         return dt.Rows[0]["CurrentQty"].ToString();
    }
    else
    {
        return "0";
    }
}

这是我的jQuery函数：

function checkStock() {
            var txt_PId = $("#content_body_content_lPId").text();
            var txt_TerminalId = $("#content_body_content_lTerminalId").text();
            var txt_CCPId = $("#content_body_content_lCCPId").text();
            var msg = "{" + String.format("'productId':'{0}', 'TerminalId':'{1}','CCPId':'{2}'", txt_PId, txt_TerminalId, txt_CCPId) + "}"
           // alert(msg);
            $.ajax({
                type: "POST",
                contentType: "application/json; charset=utf-8",
                url: "CService.asmx/GetProductStock",
                data: msg,
                dataType: "json",
                success: function (Result) {
                    alert();
                    Result = Result.d;
                   // data = Result
                    //alert(data)
                },
                error: function (Result) {
                    debugger;
                    alert("Error: " + Result.error.toString());
                    return false;
                }
            });
            return false;
        }

此jquery方法返回错误，并且当我调试错误时，错误状态代码为500。错误消息：

错误：函数（）{if（h）{var d = h.length;！function f（b）{n.each（b，function（b，c）{var d = n.type（c）;“ function “=== d a.unique && k.has（C）|| h.push（c）中：C && c.length &&”！？字符串“== d && F（C）}）}（参数），b E = h.length ：c &&（g = d，j（c））}返回此}

有人可以建议我解决这个问题吗？

Answer 1

必须在继承System.Web.Services.WebService的class上启用[System.Web.Script.Services.ScriptService] ，以通过ajax访问其方法

网络服务

    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
    [System.Web.Script.Services.ScriptService]
    public class WebServiceFile : System.Web.Services.WebService
    {

        [WebMethod]
        //[ScriptMethod(UseHttpGet = false, ResponseFormat = ResponseFormat.Json)]
        public  string GetProductStock(string productId, string TerminalId, string CCPId)
        {
            ProductsDomain objProduct = new ProductsDomain();
            objProduct.Product_Id = Convert.ToInt32(productId);
            objProduct.TerminalId = Convert.ToInt32(TerminalId);
            objProduct.CCPId = Convert.ToInt32(CCPId);
            DataTable dt = objProduct.GetProductDetail();
            if (dt.Rows.Count > 0)
            {
                return dt.Rows[0]["CurrentQty"].ToString();
            }
            else
            {
                return "0";
            }
        }

        public class ProductsDomain
        {
            public int Product_Id { get; set; }
            public int TerminalId { get; set; }
            public int CCPId { get; set; }
            public DataTable GetProductDetail()
            {
                DataTable dt = new DataTable();
                dt.Columns.Add("CurrentQty");
                DataRow dr = dt.NewRow();
                dr["CurrentQty"] = "Smith";
                dt.Rows.Add(dr);
                DataRow dr1 = dt.NewRow();
                dr1["CurrentQty"] = "John";
                dt.Rows.Add(dr1);
                return dt;

            }
        }

    }

jQuery的

function checkStock() {
            var txt_PId = 1;
            var txt_TerminalId = 2;
            var txt_CCPId = 3;
            var msg = '{productId:"' + txt_PId + '",TerminalId:"' + txt_TerminalId + '",CCPId:"' + txt_CCPId + '"}';
            debugger;
            $.ajax({
                type: "POST",
                cache: false,
                contentType: "application/json; charset=utf-8",
                url: "/WebServiceFile.asmx/GetProductStock",
                data: msg,
                dataType: "json",                
                success: function (Result) {
                    alert();
                    Result = Result.d;
                    // data = Result
                    alert(Result)
                },
                error: function (Result) {
                    debugger;
                    alert("Error: " + Result.error.toString());
                    return false;
                }
            });
        }