c# - 使用 WCF (IIS 7.5) 从数据库获取值时出现系统错误

Question

我有一个 Android 应用程序，它通过 IIS 7.5 中托管的 WCF 服务连接到数据库。我从这里开始:Walkthrough - Working with WCF .我只使用我的本地主机，我没有配置远程访问。问题是每次我单击按钮(单击时将传递输入数字的值然后处理 sql 语句然后它将返回结果将出现在按钮旁边的 textview 中)，出现一个对话框说 系统错误。我在 Android 模拟器中运行这个应用程序应该没问题，因为我只通过本地主机连接。

这是我的代码:

主 Activity .cs

btnCheck = FindViewById<ImageButton>(Resource.Id.imageButton1);
btnCheck.Click += GetEmployeeDataOnClick;

private void InitializeEmployeeServiceClient()
{
    BasicHttpBinding binding = CreateBasicHttp();
    _client = new EmployeeServiceClient(binding, EndPoint);
    _client.DisplayEmployeeCompleted += ClientOnDisplayEmployeeCompleted;
}

private static BasicHttpBinding CreateBasicHttp()
{
    BasicHttpBinding binding = new BasicHttpBinding
    {
        Name = "basicHttpBinding",
                MaxBufferSize = 2147483647,
                MaxReceivedMessageSize = 2147483647
    };
    TimeSpan timeout = new TimeSpan(0, 0, 30);
    binding.SendTimeout = timeout;
    binding.OpenTimeout = timeout;
    binding.ReceiveTimeout = timeout;
            return binding;
}

private void GetEmployeeDataOnClick(object sender, EventArgs eventArgs)
{
    empNumber = FindViewById<EditText>(Resource.Id.editText1);
    EmployeeNo employee = new EmployeeNo();
    employee.EmpNo = empNumber.Text;
    _client.DisplayEmployeeAsync(employee);
}

private void ClientOnDisplayEmployeeCompleted(object sender, DisplayEmployeeCompletedEventArgs displayEmployeeCompletedEventArgs)
{
    empName = FindViewById<TextView>(Resource.Id.textView9);
    string msg = null;
    if (displayEmployeeCompletedEventArgs.Error != null)
    {
         msg = displayEmployeeCompletedEventArgs.Error.Message;
         AlertDialog.Builder alert = new AlertDialog.Builder(this);
         alert.SetMessage(msg);
         alert.SetPositiveButton("OK", (senderAlert, args) => {});
         RunOnUiThread(() => {
                    alert.Show();});
    }
    else if (displayEmployeeCompletedEventArgs.Cancelled)
    {
         msg = "Request was cancelled.";
         AlertDialog.Builder alert = new AlertDialog.Builder(this);
         alert.SetMessage(msg);
         alert.SetPositiveButton("OK", (senderAlert, args) => {});
         RunOnUiThread(() => {
                    alert.Show();
                });
    }
    else
    {
         msg = displayEmployeeCompletedEventArgs.Result;
         RunOnUiThread(() => empName.Text = msg);

    }
}

IService.cs (WCF)

[ServiceContract]
public interface IEmployeeService
{
    [OperationContract]
    string DisplayEmployee(EmployeeNo empNo);
}

[DataContract]
public class EmployeeNo
{
    string empNumber = string.Empty;

    [DataMember]
    public string EmpNo
    {
        get { return empNumber; }
        set { empNumber = value; }
    }

}

服务.svc.cs (WCF)

public string DisplayEmployee(EmployeeNo empNo)
{
    // sql connection, statement (inputted empNo which corresponds to an EmpName)
    return EmpName;
}

我这样做正确吗？这里有什么问题？ 顺便说一句，我在这里完全是个新手。

Answer 1

将连接到 IIS 的 IP 地址更改为服务器的实际 IP 地址(在本例中为模拟器的主机)。

您也可以使用像“http://user-pc:8080/DataService”这样的主机名。