TextBoxBase.TextLength 属性

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

获取控件中文本的长度。

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

属性值

Int32

控件文本中所含的字符数。

属性

BrowsableAttribute

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

可以使用此属性来确定字符串中的字符数，以便执行一些任务，例如在控件的文本中搜索特定文本字符串，其中需要知道总字符数。

另请参阅

• Text