TextBoxBase.TextLength 屬性

定義

取得控制項中文字的長度。Gets the length of text in the control.

public:
 virtual property int TextLength { int get(); };
[System.ComponentModel.Browsable(false)]
public virtual int TextLength { get; }
[<System.ComponentModel.Browsable(false)>]
member this.TextLength : int
Public Overridable ReadOnly Property TextLength As Integer

屬性值

Int32

包含在控制項文字中的字元數目。The number of characters contained in the text of the control.

屬性

範例

下列程式碼範例示範如何使用 AppendText 方法和屬性,將 TextLength 文字從一個複製 TextBox 到另一個。The following code example demonstrates how to use the AppendText method and the TextLength property to copy text from one TextBox to another. 這個範例需要兩個 TextBox 名為、和的控制項已 textBox1 textBox2 加入至表單,並將 textBox1 文字指派給它的 Text 屬性。This example requires that two TextBox controls named, textBox1 and textBox2, have been added to a form and that textBox1 has text assigned to its Text property.

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

備註

您可以使用這個屬性來決定工作字串中的字元數,例如搜尋控制項文字內的特定文字字串,以及需要的字元總數。You can use this property to determine the number of characters in a string for tasks such as searching for specific strings of text within the text of the control, where knowledge of the total number of characters is needed.

適用於

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