TextBoxBase.AppendText(String) 方法

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

向文本框的当前文本追加文本。

public:
 void AppendText(System::String ^ text);

public void AppendText (string? text);

member this.AppendText : string -> unit

Public Sub AppendText (text As String)

参数

text

String

要向文本框的当前内容追加的文本。

示例

下面的代码示例演示如何使用 AppendText 方法和 TextLength 属性将文本从一个复制到另一个 TextBox 。 此示例要求已将两 TextBox 个名为 textBox1 和 textBox2的控件添加到窗体中，并且 textBox1 具有分配给其 Text 属性的文本。

void AppendTextBox1Text()
{
   // Determine if text is selected in textBox1.
   if ( textBox1->SelectionLength == 0 )

   // No selection made, return.
   return;

   // Determine if the text being appended to textBox2 exceeds the MaxLength property.
   if ( (textBox1->SelectedText->Length + textBox2->TextLength) > textBox2->MaxLength )
         MessageBox::Show( "The text to paste in is larger than the maximum number of characters allowed" ); // Append the text from textBox1 into textBox2.
   else
         textBox2->AppendText( textBox1->SelectedText );
}

private void AppendTextBox1Text()
{
   // Determine if text is selected in textBox1.
   if(textBox1.SelectionLength == 0)
      // No selection made, return.
      return;
   
   // Determine if the text being appended to textBox2 exceeds the MaxLength property.
   if((textBox1.SelectedText.Length + textBox2.TextLength) > textBox2.MaxLength)
      MessageBox.Show("The text to paste in is larger than the maximum number of characters allowed");
   else
      // Append the text from textBox1 into textBox2.
      textBox2.AppendText(textBox1.SelectedText);
}

Private Sub AppendTextBox1Text()
   ' Determine if text is selected in textBox1.
   If textBox1.SelectionLength = 0 Then
      ' No selection made, return.
      Return
   End If
   ' Determine if the text being appended to textBox2 exceeds the MaxLength property.
   If textBox1.SelectedText.Length + textBox2.TextLength > textBox2.MaxLength Then
      MessageBox.Show("The text to paste in is larger than the maximum number of characters allowed")
      ' Append the text from textBox1 into textBox2.
   Else
      textBox2.AppendText(textBox1.SelectedText)
   End If
End Sub

注解

可以使用此方法将文本添加到 控件中的现有文本，而不是使用串联运算符 (+) 将文本 Text 连接到 属性。

另请参阅

• Copy()
• Paste()