RichTextBox.SelectionLength 属性

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

获取或设置控件中选定的字符数。

public:
 virtual property int SelectionLength { int get(); void set(int value); };

[System.ComponentModel.Browsable(false)]
public override int SelectionLength { get; set; }

[<System.ComponentModel.Browsable(false)>]
member this.SelectionLength : int with get, set

Public Overrides Property SelectionLength As Integer

属性值

Int32

文本框中选定的字符数。

属性

BrowsableAttribute

示例

下面的代码示例演示如何使用 SelectionLength 属性来确定 是否在 RichTextBox中选择文本。 此示例要求 RichTextBox 已将名为 richTextBox1的控件添加到窗体中。 该示例还要求 richTextBox1 包含 控件中选择的文本。

private:
   void ModifySelectedText()
   {
      // Determine if text is selected in the control.
      if ( richTextBox1->SelectionLength > 0 )
      {
         // Set the color of the selected text in the control.
         richTextBox1->SelectionColor = Color::Red;

         // Set the font of the selected text to bold and underlined.
         richTextBox1->SelectionFont = gcnew System::Drawing::Font( "Arial",10,static_cast<FontStyle>(FontStyle::Bold | FontStyle::Underline) );

         // Protect the selected text from modification.
         richTextBox1->SelectionProtected = true;
      }
   }

private void ModifySelectedText()
{
   // Determine if text is selected in the control.
   if (richTextBox1.SelectionLength > 0)
   {
      // Set the color of the selected text in the control.
      richTextBox1.SelectionColor = Color.Red;
      // Set the font of the selected text to bold and underlined.
      richTextBox1.SelectionFont = new Font("Arial",10,FontStyle.Bold | FontStyle.Underline);
      // Protect the selected text from modification.
      richTextBox1.SelectionProtected = true;
   }
}

Private Sub ModifySelectedText()
    ' Determine if text is selected in the control.
    If (richTextBox1.SelectionLength > 0) Then
        ' Set the color of the selected text in the control.
        richTextBox1.SelectionColor = Color.Red
        ' Set the font of the selected text to bold and underlined.
        richTextBox1.SelectionFont = New Font("Arial", 10, FontStyle.Bold Or FontStyle.Underline)
        ' Protect the selected text from modification.
        richTextBox1.SelectionProtected = True
    End If
End Sub

注解

在对所选文本执行操作之前，可以使用此属性来确定当前是否在文本框控件中选择了任何字符。 还可以使用此属性来确定在循环中 for 执行单字符任务时选择的字符总数 (包括空格) 。

另请参阅

• SelectionStart
• SelectedText