不知道如何使用詞組：重寫教程中的方法

Question

我試圖創建一個自定義的MembershipUser，並且必須覆蓋GetUser（）方法。

我下面這個教程：http://msdn.microsoft.com/en-us/library/ms366730.aspx

這裏是我有：

public override MembershipUser GetUser(string username, bool userIsOnline) 
    { 
     CustomMembershipConext db = new CustomMembershipConext(); 

     var user = db.User.Where(u => u.UserName == username).FirstOrDefault(); 

     if (userIsOnline) 
     { 
      user.LastActivityDate = DateTime.Now; 

     } 

     return user; 
     // Error 4 Cannot implicitly convert type 'MvcApplication1.Models.User' to 'System.Web.Security.MembershipUser' 

    } 
} 

我試圖複製此：

public override MembershipUser GetUser(string username, bool userIsOnline) 
{ 
    OdbcConnection conn = new OdbcConnection(connectionString); 
    OdbcCommand cmd = new OdbcCommand("SELECT PKID, Username, Email, PasswordQuestion," + 
     " Comment, IsApproved, IsLockedOut, CreationDate, LastLoginDate," + 
     " LastActivityDate, LastPasswordChangedDate, LastLockedOutDate," + 
     " IsSubscriber, CustomerID" + 
     " FROM Users WHERE Username = ? AND ApplicationName = ?", conn); 

    cmd.Parameters.Add("@Username", OdbcType.VarChar, 255).Value = username; 
    cmd.Parameters.Add("@ApplicationName", OdbcType.VarChar, 255).Value = pApplicationName; 

    OdbcMembershipUser u = null; 
    OdbcDataReader reader = null; 

    try 
    { 
    conn.Open(); 

    reader = cmd.ExecuteReader(); 

    if (reader.HasRows) 
    { 
     reader.Read(); 
     u = GetUserFromReader(reader); 

     if (userIsOnline) 
     { 
     OdbcCommand updateCmd = new OdbcCommand("UPDATE Users " + 
        "SET LastActivityDate = ? " + 
        "WHERE Username = ? AND Applicationname = ?", conn); 

     updateCmd.Parameters.Add("@LastActivityDate", OdbcType.DateTime).Value = DateTime.Now; 
     updateCmd.Parameters.Add("@Username", OdbcType.VarChar, 255).Value = username; 
     updateCmd.Parameters.Add("@ApplicationName", OdbcType.VarChar, 255).Value = pApplicationName; 

     updateCmd.ExecuteNonQuery(); 
     } 
    } 

    } 
    catch (OdbcException e) 
    { 
    if (WriteExceptionsToEventLog) 
    { 
     WriteToEventLog(e, "GetUser(String, Boolean)"); 

     throw new ProviderException(exceptionMessage); 
    } 
    else 
    { 
     throw e; 
    } 
    } 
    finally 
    { 
    if (reader != null) { reader.Close(); } 

    conn.Close(); 
    } 

    return u;  
} 

Answer 1

用戶類型用戶的不，它仍然是一個IQueryable < ...>。您需要從查詢結果中提取用戶對象：

var user = db.User.Where(u => u.UserName == username).FirstOrDefault();