TextBoxBase.AppendText(String) 方法
重要
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向文本框的当前文本追加文本。
public:
void AppendText(System::String ^ text);public void AppendText(string text);public void AppendText(string? text);member this.AppendText : string -> unitPublic Sub AppendText (text As String)- text
- String
要向文本框的当前内容追加的文本。
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
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。
| 产品 | 版本 |
|---|---|
| .NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| Windows Desktop | 3.0, 3.1, 5, 6, 7, 8, 9, 10 |
