c＃文本框沒有清除

我有一個程序寫入Access數據表，然後信息顯示在數據網格中。當文本框中出現一個6位數字後跟一個"L"時，會觸發此操作。我有"TextBox1.Clear();"在清除6個數字的代碼，但不是"L"。c＃文本框沒有清除

這裏是我的代碼：

private void Registration_Main(object sender, KeyPressEventArgs e) 
    { 
     SqlConnection DBConnection = new SqlConnection("Data Source=DATABASE;Initial Catalog=imis;Integrated Security=True"); 
     SqlCommand cmd = new SqlCommand(); 
     Object returnValue; 
     Object returnName; 
     string txtend = textBox1.Text; 


     if (e.KeyChar == 'L') 
     { 
      DBConnection.Open(); 
     } 


     if (DBConnection.State == ConnectionState.Open) 
     { 
      if (textBox1.Text.Length != 6) return; 
      { 
       cmd.CommandText = ("SELECT last_name +', '+ first_name from name where id [email protected]"); 
       cmd.Parameters.Add(new SqlParameter("Name", textBox1.Text.Replace(@"L", ""))); 
       cmd.CommandType = CommandType.Text; 
       cmd.Connection = DBConnection; 
       returnValue = cmd.ExecuteScalar() + "\t " + textBox1.Text.Replace(@"L", ""); 
       returnName = cmd.ExecuteScalar(); 

       DBConnection.Close(); 

       AccessDB_Connection(returnName); 
      } 

      textBox1.Clear(); 
     } 
    } 

    private void AccessDB_Connection(object returnName) 
    { 
     String varID; 
     Object varName; 

     varID = textBox1.Text.Replace(@"L", "").ToString(); 
     varName = returnName; 

     OleDbConnection OLEDB_Connection = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=\\Test Applications\\Tablet Registration - Access Database\\Tablet Registration - Access\\Tablet Registration - Access\\Registration.accdb"); 
     OleDbCommand updateCmd = new OleDbCommand(); 

     try 
     { 
      updateCmd.CommandText = "INSERT INTO TestDB ([Name], [ID]) VALUES (@NAME, @ID)"; 
      updateCmd.Parameters.AddWithValue("@NAME", varName); 
      updateCmd.Parameters.AddWithValue("@ID", varID); 
      OLEDB_Connection.Open(); 
      updateCmd.Connection = OLEDB_Connection; 
      updateCmd.ExecuteNonQuery(); 
      this.testDBTableAdapter.Fill(this.registrationDataSet1.TestDB); 
      OLEDB_Connection.Close(); 
     } 
     catch 
     { 
     } 
    }

任何幫助，非常感謝！

來源

2013-11-22 Ryan Gillooly

@Bhavesh我不認爲這會有什麼區別 – geedubb

@Ryan這是一個winforms應用程序？ – geedubb

嘗試從更新代碼：

if (e.KeyChar == 'L') 
    { 
     DBConnection.Open(); 
    }

到

if (e.KeyChar == 'L') 
    { 
     e.Handled = true; 
     DBConnection.Open(); 
    }

這應停止活動傳播和填充您的文本。

來源

2013-11-22 16:24:12 geedubb

這將是正確的答案:) +1 –

確實是:)乾杯的人！ –

c＃文本框沒有清除

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