捕获多个异常-C# [重复]

Posted 2023-02-23

【中文标题】捕获多个异常-C# [重复]

【英文标题】：Catching Multiple Exceptions-C# [duplicate]

【发布时间】：2016-05-28 20:16:34

【问题描述】：

如何在我的代码中捕获多个异常？就像我对Delete 操作有以下代码一样，我想为REFERENCE constraint 和SqlConnection 异常捕获异常。

public void DeleteProduct(Product p)

    try
    
        using (IDbCommand cmd = dbConnection.CreateCommand())
        
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandText = SpDeleteProduct;
            dbConnection.Open();
            cmd.ExecuteNonQuery();
        
    
    catch (Exception ex)
    
        System.ServiceModel.Web.WebOperationContext.Current.OutgoingResponse.StatusCode = System.Net.HttpStatusCode.OK;
        throw new FaultException(new FaultReason(new FaultReasonText(ex.Message)));
      
 

然后在我的客户端代码中，我想检查抛出的异常类型，以便向用户显示个性化消息：

void DeleteProductCompleted(object sender, AsyncCompletedEventArgs e)

    if (e.Error != null)
    
        FaultException fault = e.Error as FaultException;
        //Something like
        // if e.Error == SqlConnection Exception
        GetExceptionMessage("Error occured in connecting to DB");
        // if e.Error == Refeence constraint Exception
        GetExceptionMessage("foreign key violation");
    

有可能吗？

【参考方案1】：

您可以在单独的 catch 块中捕获特定异常

try

    using (IDbCommand cmd = dbConnection.CreateCommand())
    
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.CommandText = SpDeleteProduct;
        dbConnection.Open();
        cmd.ExecuteNonQuery();
    

catch (SqlException ex)

   //Your exception specific code...
  
catch (Exception ex) 

   //Your exception specific code...
  

至于良好的编码习惯，不要捕获泛型异常 -catch (Exception ex)，而是只捕获您期望的特定异常，而不捕获泛型异常。就算抓到也扔掉。

catch (Exception ex) 

  // do your logging only if required
   throw; //throw it back
  

【讨论】：

有效吗？ catch (SqlConnection ex) 。我收到错误SqlConnection doesn't exist

我想他可能是指SqlException