包装异常 [英] Wrapping an exception

问题描述

如果出现任何主键冲突错误而没有说主键违反了GUI，如何从数据访问层向GUI层抛出异常.

How can I throw an exception to the GUI layer from my Data Access layer if any primary key violation error comes without saying primary key violated to the GUI.

推荐答案

您需要从数据层抛出异常，例如:

You need to throw an exception from your datalayer for example :

public void ConnectDatabase()
{
  try
  {
    SqlConnection myConnection = new SqlConnection("connectionstring");
    myConnection.Open();
  }
  catch (SqlException sqlEx)
  {
    // Include inner exception to give more information about what went wrong
    throw new MyCustomException("Failed to open new SQL Connection", sqlEx);
  }
}

在Gui层中，您将连接到某个地方的数据库，此时，您需要捕获自定义的异常:

In your Gui layer, you''ll connect to the database somewhere, at that point, you need to catch your custom made exception :

// Application starts
try
{
  DataLayerObject myObject = new DataLayerObject();
  myObject.ConnectDatabase();
}
catch (MyCustomException customEx)
{
  MessageBox.Show(customEx.Message);
}

玩得开心！

爱德华

Have fun!

Eduard

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