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我想用C#和JSON創建一個.NET webservice。但我的錯誤在我的web服務的返回聲明中,cannot implicitly convert type 'string' to 'Model.User'
如何解決該錯誤行?爲什麼我在使用JSON的.NET webservice中獲取Error StreamReader?
這裏是我的WebService.asmx:
[OperationContract]
public Model.User GetUser(string ccduser)
{
Model.User user = new Model.User();
string connectionString = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;
using (SqlConnection connection = new SqlConnection(connectionString)) {
string sql = "Select * from ms_webuser where ccduser = '" + ccduser + "'";
connection.Open();
SqlCommand command = new SqlCommand(sql, connection);
SqlDataReader reader = command.ExecuteReader();
while (reader.Read())
{
user.cnmuser = reader["cnmuser"].ToString();
}
}
MemoryStream stream = new MemoryStream();
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(Model.User));
serializer.WriteObject(stream, user);
stream.Position = 0;
StreamReader streamReader = new StreamReader(stream);
return streamReader.ReadToEnd(); //here is the error red line
}
這裏是我的Model.User類:
namespace Model
{
public class User
{
private string _ccduser;
private string _cnmuser;
public string ccduser
{
get { return _ccduser; }
set { _ccduser = value; }
}
public string cnmuser
{
get { return _cnmuser; }
set { _cnmuser = value; }
}
}
}
謝謝@MAV,現在它可以工作,我將方法改爲'String' – blankon91