C# 将击键发送到其他控件
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Send keystroke to other control
提问by vIceBerg
Easy one for you guys.
给你们一个简单的。
I have a textbox on top of a listbox.
我在列表框顶部有一个文本框。
The textbox is use to filter ther data in the listbox.
文本框用于过滤列表框中的数据。
So... When the user type in the textbox, I would like to "trap" the down/up/pagedown/pageup keystrokes and fowarding them to the listbox.
所以......当用户在文本框中键入时，我想“捕获”向下/向上/翻页/翻页键击并将它们转发到列表框。
I know I could use the Win32 API and send the WM_KeyDown message. But there's must be some .NET way to do this.
我知道我可以使用 Win32 API 并发送 WM_KeyDown 消息。但是必须有一些 .NET 方法来做到这一点。
采纳答案by adatapost
SendKeys.Send() Method.
SendKeys.Send() 方法。
private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
listBox1.Focus();
SendKeys.Send(e.KeyChar.ToString());
}
Here is code through which you can select a list item.
这是您可以选择列表项的代码。
private void Form1_Load(object sender, EventArgs e)
{
textBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
textBox1.AutoCompleteSource=AutoCompleteSource.CustomSource;
string[] ar = (string[])(listBox1.Items.Cast<string>()).ToArray<string>();
textBox1.AutoCompleteCustomSource.AddRange(ar);
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
listBox1.Text = textBox1.Text;
}
回答by Jacob Seleznev
You can use Data Binding
您可以使用数据绑定
listBox1.DataBindings.Add("DataSource", textBox1, "Text", true, DataSourceUpdateMode.OnPropertyChanged).
Format += (sender, e) =>
{
e.Value = _strings.FindAll(s => s.StartsWith((string) e.Value));
};
回答by Eric
In our wpf app we have a textbox that filters a listbox, we use the previewkeyup event. Inside the code, we can check what key was pressed (don't have my code in front of me, it's something like e.Key == Key.UpArrow, either way there's a built in class in C# for this). If it's one of the hot keys, we manipulate the user control accordingly.
在我们的 wpf 应用程序中，我们有一个过滤列表框的文本框，我们使用 previewkeyup 事件。在代码中，我们可以检查按下了什么键（不要在我面前放我的代码，它类似于 e.Key == Key.UpArrow，无论哪种方式，C# 中都有一个内置类）。如果它是热键之一，我们会相应地操纵用户控件。
For the listbox we tossed it into a user control and implemented an interface, called it NavigateableListbox or something like that, forced it to implement MoveUp(), MoveDown(), PageUp(), PageDown() etc so the textbox event just says if e.Key = Key.UpArrow { mylistbox.MoveUp() }
对于列表框，我们将其放入用户控件并实现了一个接口，称为 NavigateableListbox 或类似的东西，强制它实现 MoveUp()、MoveDown()、PageUp()、PageDown() 等，因此文本框事件只是说如果e.Key = Key.UpArrow { mylistbox.MoveUp() }
回答by Stacey Richards
private void textBox_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
{
if (e.KeyCode == Keys.PageUp || e.KeyCode == Keys.PageDown || e.KeyCode == Keys.Up || e.KeyCode == Keys.Down)
{
// Setting e.IsInputKey to true will allow the KeyDown event to trigger.
// See "Remarks" at https://msdn.microsoft.com/en-us/library/system.windows.forms.control.previewkeydown(v=vs.110).aspx
e.IsInputKey = true;
}
}
private void textBox_KeyDown(object sender, KeyEventArgs e)
{
string send = "";
if (e.KeyCode == Keys.PageUp)
{
send = "PGUP";
}
else if (e.KeyCode == Keys.PageDown)
{
send = "PGDN";
}
else if (e.KeyCode == Keys.Up)
{
send = "UP";
}
else if (e.KeyCode == Keys.Down)
{
send = "DOWN";
}
if (send != "")
{
// We must focus the control we want to send keys to and use braces for special keys.
// For a list of all special keys, see https://msdn.microsoft.com/en-us/library/system.windows.forms.sendkeys.send(v=vs.110).aspx.
listBox.Focus();
SendKeys.SendWait("{" + send + "}");
textBox.Focus();
// We must mark the key down event as being handled if we don't want the sent navigation keys to apply to this control also.
e.Handled = true;
}
}
回答by schlebe
SendKeys.Send()method does'nt work in all situations because Send()method can be addressed to another Control !
SendKeys.Send()方法并非在所有情况下都有效，因为Send()方法可以寻址到另一个 Control ！
In 2020, the best solution to be sure at 100% is to use SendMessage() function.
在 2020 年，确保 100% 的最佳解决方案是使用 SendMessage() 函数。
In VB.Net, I use following code
在 VB.Net 中，我使用以下代码
Public Declare Auto Function SendMessage Lib "user32.dll"
( ByVal hWnd As IntPtr
, ByVal wMsg As Int32
, ByVal wParam As Int32
, ByVal s As Int32
) As Int32
Private Const WM_CHAR As Int32 = &H102
SendMessage(txtInput.Handle, WM_CHAR, AscW(sValue.Chars(0)), 0)
Where txtInputis a sample Textboxcontrol.
txtInput样品Textbox对照在哪里。
In my case, I click on html <div>element defined in a WebViewcontrol that changes color when I click on it or when mouse move over. When I click on this <div>a ScriptNotify() VB.Net method is called to enter some characters in Textboxusing SendMessage()function.
在我的例子中，我点击<div>了一个WebView控件中定义的html元素，当我点击它或鼠标移过它时会改变颜色。当我点击这个<div>ScriptNotify() VB.Net 方法被调用以在TextboxusingSendMessage()函数中输入一些字符。
In old solution, I think that sometimes, WebViewgain focus before SendKeys.Send()method is called so that propagated key is not send to txtInputTextbox.
在旧的解决方案中，我认为有时WebView在SendKeys.Send()调用方法之前获得焦点，以便传播的密钥不会发送到txtInput文本框。
You can use old solution, but be certain that one day, SendKeys.Send() function will send what you want to another Handle.
您可以使用旧的解决方案，但请确保有一天，SendKeys.Send() 函数会将您想要的内容发送到另一个句柄。
