前台：ShowDetail("英伦学院派马夹");

function ShowDetail(productId) {

// make an ajax call to the web service to get Car detail

$.ajax({

type: "GET",

contentType: "application/json; charset=utf-8",

url: "ProductService.asmx/GetProductByIds",

data: "{Productname:" + productId + "}",

dataType: "json",

success: SelectProductByIdSuccess,

error: function (XMLHttpRequest, textStatus, errorThrown) {

alert(errorThrown + ':' + textStatus);

}

});

后台：  ///

/// 根据商品名称查询商品

///

/// 商品名称

/// 商品

[WebMethod]

[ScriptMethod(ResponseFormat = ResponseFormat.Json, UseHttpGet = true)]

public List GetProductByIds(string Productname)

{

return dataSource.GetProductByName(Productname);

}

}

public List GetProductByName(string name)

{

return productList.Where(p => p.ProductName == name).ToList();

}

private List productList = new List()

{

new Product(){ProductId=1,ProductName="笔记本", Price=10000M, Stock=10},

new Product(){ProductId=2,ProductName="格子绒长袖衬衫", Price=90M, Stock=20},

new Product(){ProductId=3,ProductName="纯棉长袖T恤", Price=99M, Stock=40},

new Product(){ProductId=4,ProductName="炫彩T恤", Price=67M, Stock=30},

new Product(){ProductId=5,ProductName="直筒裤男牛仔裤", Price=100M, Stock=20},

new Product(){ProductId=6,ProductName="[无印严选]纯色V领长袖T恤", Price=67M, Stock=50},

new Product(){ProductId=7,ProductName="英伦学院派马夹", Price=44M, Stock=40},

new Product(){ProductId=8,ProductName="纯棉连帽宽松卫衣", Price=66M, Stock=30},

new Product(){ProductId=9,ProductName="纯棉多口袋工装裤", Price=80M, Stock=990},

new Product(){ProductId=10,ProductName="假两件长袖T恤", Price=89M, Stock=30},

};

调试错误：{"Message":"Web 服务调用无效，参数“Productname”缺少值。","StackTrace":"   在 System.Web.Script.Services.WebServiceMethodData.CallMethod(Object target, IDictionary`2 parameters)\r\n   在 System.Web.Script.Services.WebServiceMethodData.CallMethodFromRawParams(Object target, IDictionary`2 parameters)\r\n   在 System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext context, WebServiceMethodData methodData, IDictionary`2 rawParams)\r\n   在 System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)","ExceptionType":"System.InvalidOperationException"}