webmethod:不能将类型字符串转换为int

Question

嗨,我得到这个代码:不能将类型字符串转换为int.

        CalculateSumOfList.ServiceReference1.Service1SoapClient client = new CalculateSumOfList.ServiceReference1.Service1SoapClient();
        CalculateSumOfList.ServiceReference1.ArrayOfInt arrayOfInt = new CalculateSumOfList.ServiceReference1.ArrayOfInt();
        arrayOfInt.AddRange(listInt);
        int result = client.CalculateSum(arrayOfInt); //error here!
        label1.Text = Convert.ToString(result);

我打电话的网络方法在这里:

namespace CalculateWebServiceSum
{
    /// <summary>
    /// Summary description for Service1
    /// </summary>
    [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 Service1 : System.Web.Services.WebService
    {

        [WebMethod]
        public string CalculateSum(List<int> listInt)
        {
            int[] sum = listInt.ToArray();

            return sum.ToString();

        }
    }
}

Answer 1

错误消息非常清楚.你的方法,CalculateSum()返回一个字符串.在发生错误的行上,您尝试使用字符串结果来设置int的值:

int result = client.CalculateSum(arrayOfInt);
^ type int   ^ returns string

选项1

我建议你改变CalculateSum()这个:

public int CalculateSum(List<int> listInt)
{
    return listInt.Sum();
}

注意:我不确定你为什么要传递List<int>给Web服务进行总结.如果你有List<int>,只需打电话List<int>.Sum(),不需要WS.

选项2

既然你.ToString()在检索它之后调用了int,为什么不把它作为字符串检索呢？

string result = client.CalculateSum(arrayOfInt);

public string CalculateSum(List<int> listInt)
{
    return listInt.Sum().ToString();
}