我在c#中实现了一个记事本应用程序,所有的功能都完美无缺,只有一件事情无法实现,编辑下拉菜单中有一些菜单,但是它们的启用属性必须根据文本框,我有两个情况的问题,我正在寻找一个事件,以更改他们启用的属性在这个事件的事件处理程序,这里是问题：
2)当在文本框中选择一些文本时,删除,复制和粘贴选项应该被启用.我应该检测它吗？我已经测试了texchanged事件,我已经写了一个条件,如下面的代码,但它没有工作只是剪贴板效果很好：
private void textBox1_TextChanged(object sender,EventArgs e) { if (textBox1.SelectionLength> 0) button1.Enabled = false; if (Clipboard.ContainsText()) button2.Enabled = false; }
我应该如何解决我的问题,我必须使用一个文本框而不是一个富文本框.
任何建议将不胜感激.
非常感谢
解决方法
找出选择
if (textBox1.SelectionLength > 0) { }
对于剪贴板内容,
使用
System.Windows.Forms.Clipboard.getText();
检查剪贴板内容,
IDataObject iData = Clipboard.GetDataObject();
// Is Data Text?
if (iData.GetDataPresent(DataFormats.Text))
label1.Text = (String)iData.GetData(DataFormats.Text);
else
label1.Text = "Data not found.";
这是在代码中实现的.您可以直接使用它如上
最重要的是,别忘了
public virtual string SelectedText { get; set; }
private void Menu_Copy(System.Object sender,System.EventArgs e)
{
// Ensure that text is selected in the text Box.
if(textBox1.SelectionLength > 0)
// Copy the selected text to the Clipboard.
textBox1.Copy();
}
private void Menu_Cut(System.Object sender,System.EventArgs e)
{
// Ensure that text is currently selected in the text Box.
if(textBox1.SelectedText.Length > 0)
// Cut the selected text in the control and paste it into the Clipboard.
textBox1.Cut();
}
Private void Menu_Paste(System.Object sender,System.EventArgs e)
{
// Determine if there is any text in the Clipboard to paste into the text Box.
if(Clipboard.GetDataObject().GetDataPresent(DataFormats.Text))
{
// Determine if any text is selected in the text Box.
if(textBox1.SelectionLength > 0)
{
// Ask user if they want to paste over currently selected text.
if(MessageBox.Show("Do you want to paste over current selection?","Cut Example",MessageBoxButtons.YesNo) == DialogResult.No)
// Move selection to the point after the current selection and paste.
textBox1.SelectionStart = textBox1.SelectionStart + textBox1.SelectionLength;
}
// Paste current text in Clipboard into text Box.
textBox1.Paste();
}
}
private void Menu_Undo(System.Object sender,System.EventArgs e)
{
// Determine if last operation can be undone in text Box.
if(textBox1.CanUndo == true)
{
// Undo the last operation.
textBox1.Undo();
// Clear the undo buffer to prevent last action from being redone.
textBox1.ClearUndo();
}
}
