更改“文本框”中的粘贴内容
本文关键字:文本 文本框 更改 | 更新日期: 2023-09-27 18:10:22
如何动态更改文本框中粘贴的内容?
订阅事件:
DataObject.AddPastingHandler (uiTextBox, TextBoxPaste);
下面是我如何定义事件处理程序:
private void TextBoxPaste (object sender, DataObjectPastingEventArgs args)
{
string clipboard = args.DataObject.GetData (typeof (string)) as string;
Regex nonNumeric = new System.Text.RegularExpressions.Regex (@"'D");
string result = nonNumeric.Replace (clipboard, String.Empty);
// I can't just do "args.DataObject.SetData (result)" here.
}
不能调用args.DataObject。SetData("一些数据"),因为DataObject被冻结了。您可以做的是完全替换DataObject:
private void TextBoxPaste(object sender, DataObjectPastingEventArgs e) {
string text = (String)e.DataObject.GetData(typeof(String));
DataObject d = new DataObject();
d.SetData(DataFormats.Text, text.Replace(Environment.NewLine, " "));
e.DataObject = d;
}
我能想到两种方法,没有一种很吸引人:)而且这两种方法都包括取消粘贴命令。
第一种方法是取消粘贴命令,然后计算如果粘贴result
,粘贴后文本看起来会是什么样子。
private void TextBoxPaste(object sender, DataObjectPastingEventArgs args)
{
string clipboard = args.DataObject.GetData(typeof(string)) as string;
Regex nonNumeric = new System.Text.RegularExpressions.Regex(@"'D");
string result = nonNumeric.Replace(clipboard, String.Empty);
int start = uiTextBox.SelectionStart;
int length = uiTextBox.SelectionLength;
int caret = uiTextBox.CaretIndex;
string text = uiTextBox.Text.Substring(0, start);
text += uiTextBox.Text.Substring(start + length);
string newText = text.Substring(0, uiTextBox.CaretIndex) + result;
newText += text.Substring(caret);
uiTextBox.Text = newText;
uiTextBox.CaretIndex = caret + result.Length;
args.CancelCommand();
}
另一种方法是取消粘贴命令,更改剪贴板中的文本,然后重新执行粘贴。这还要求您区分实际的粘贴命令和手动调用的粘贴命令。像这样
bool m_modifiedPaste = false;
private void TextBoxPaste(object sender, DataObjectPastingEventArgs args)
{
if (m_modifiedPaste == false)
{
m_modifiedPaste = true;
string clipboard = args.DataObject.GetData(typeof(string)) as string;
Regex nonNumeric = new System.Text.RegularExpressions.Regex(@"'D");
string result = nonNumeric.Replace(clipboard, String.Empty);
args.CancelCommand();
Clipboard.SetData(DataFormats.Text, result);
ApplicationCommands.Paste.Execute(result, uiTextBox);
}
else
{
m_modifiedPaste = false;
}
}
我使用VB.net相当多,我已经测试了这个c#位,我使用了一个转换器,因为我很蹩脚:)
string oClipboard;
private void TextBox1_GotFocus(object sender, System.EventArgs e)
{
oClipboard = Clipboard.GetText();
Clipboard.SetText("foo");
}
private void TextBox1_LostFocus(object sender, System.EventArgs e)
{
Clipboard.SetText(oClipboard);
}
当控件获得焦点时,我将剪贴板设置为新文本。它存储旧的值。稍后,当控件失去焦点时,剪贴板将被设置回旧值。
只是对@Fredrik的代码做了一些修改,因为我一直在尝试他的两个方法。
第一个是缩短版
private void TextBox_Pasting(object sender, DataObjectPastingEventArgs e)
{
string clipboard = e.DataObject.GetData(typeof(string)) as string;
Regex nonNumeric = new System.Text.RegularExpressions.Regex (@"'D");
string result = nonNumeric.Replace(clipboard, string.Empty);
int caret = CaretIndex;
Text = Text.Substring(0, SelectionStart) + result +
Text.Substring(SelectionStart + SelectionLength);
CaretIndex = caret + result.Length;
e.CancelCommand();
}
,另一个更新为保持剪贴板内容
private string oldClipboardContent { get; set; } = "";
private bool pasteModified { get; set; } = false;
private void TextBox_Pasting(object sender, DataObjectPastingEventArgs e)
{
if (pasteModified)
{
pasteModified = false;
}
else
{
pasteModified = true;
string text = (string)e.DataObject.GetData(typeof(string));
oldClipboardContent = text;
Regex nonNumeric = new System.Text.RegularExpressions.Regex (@"'D");
text = nonNumeric.Replace(text, string.Empty);
e.CancelCommand();
Clipboard.SetData(DataFormats.Text, text);
ApplicationCommands.Paste.Execute(text, this);
Clipboard.SetData(DataFormats.Text, OldClipboardContent);
oldClipboardContent = "";
}
}
我使用的是那些在我的自定义TextBox
控制,这就是为什么我可以访问TextBox
属性,而不需要先写名字。