免责声明 :这不是一个重复的职位。 我用Google搜索有关的问题。 又看了这个 , 这个和这个做题。 我尝试了一些这些东西,但似乎没有什么帮助。
考虑下面这个简单的示例代码。 这只是一个空的ElementHost的一个WinForm(内部没有WPF控件)内:
using System.Windows.Forms;
using System.Windows.Forms.Integration;
namespace WindowsFormsApplication15
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
ElementHost host = new ElementHost();
host.Dock = DockStyle.Fill;
this.Controls.Add(host);
}
}
}
当调整表格 ,你可以看到在表单边境两个黑边:
请¿有人能够给过我的例子一个工作解决方案解决这个问题?
试试这个(同样的想法,你所提供的第一个链接,但更好的性能):
public class ElementHost2 : ElementHost {
public ElementHost2() {
this.AutoSize = true;
}
public override Size GetPreferredSize(Size proposedSize) {
Form f = this.FindForm();
Size s = f.ClientSize;
return s;
}
private const uint WM_SETREDRAW = 0xB;
[DllImport("user32.dll")]
private static extern int SendMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);
[DllImport("user32.dll")]
static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);
private const uint NOSIZE = 0x0001;
private const uint NOMOVE = 0x0002;
private const uint NOZORDER = 0x0004;
private const uint NOREDRAW = 0x0008;
private const uint NOACTIVATE = 0x0010;
private const uint DRAWFRAME = 0x0020;
private const uint FRAMECHANGED = 0x0020;
private const uint SHOWWINDOW = 0x0040;
private const uint HIDEWINDOW = 0x0080;
private const uint NOCOPYBITS = 0x0100;
private const uint NOOWNERZORDER = 0x0200;
private const uint NOREPOSITION = 0x0200;
private const uint NOSENDCHANGING = 0x0400;
private const uint DEFERERASE = 0x2000;
private const uint ASYNCWINDOWPOS = 0x4000;
protected override void OnResize(EventArgs e) {
base.OnResize(e);
SendMessage(this.Handle, WM_SETREDRAW, 0, 0);
SendMessage(this.Handle, WM_SETREDRAW, 1, 0);
// forces window to redraw:
SetWindowPos(this.Handle, IntPtr.Zero, 0, 0, 0, 0, NOSIZE | NOMOVE| NOZORDER | NOACTIVATE | SHOWWINDOW);
}
// better performance?
protected override void OnPaintBackground(PaintEventArgs pevent) {
//base.OnPaintBackground(pevent);
}
protected override void OnPaint(PaintEventArgs e) {
//base.OnPaint(e);
}
}
class Form2 : Form {
ElementHost host = new ElementHost2();
public Form2() {
Controls.Add(host);
this.BackColor = Color.Red;
var p = new System.Windows.Controls.DockPanel();
p.Background = System.Windows.Media.Brushes.Red;
host.Child = p;
p.Children.Add(new System.Windows.Controls.TextBox { Width = 100, Height = 20 });
}
}
这个问题是不相关的ElementHost的和WinForms。 这只是一个WPF的问题,我发现下面的SO问题的答案:
如何修复WPF窗体调整大小-控制落后和黑色背景吗?