我怎么可以把一个WinForms控制/形式在C＃中的截图？ [英] How can I take a screenshot of a Winforms control/form in C#?

问题描述

我有一个列表视图控件是一个WinForms形式。它填补了全屏，但也有更多的项目有比屏幕可以显示。

I have a listview control that is on a winforms form. It fills the full screen but there are more items there than the screen can show.

我怎么能取整控制，如果我能显示列表视图在屏幕上的全部内容的截图？因此，如果整个列表视图采用1000×4000像素，那么我想该尺寸的图像/位图

How can I take a screenshot of the whole control as if I could display the whole contents of the listview on screen? So if the whole listview takes 1000 x 4000 pixels, then I want an image/bitmap of that size.

我如何做到这一点？当我尝试PRINTSCREEN，它只返回什么是在屏幕上，屏幕以外的任何东西显示为灰色。

How do I do this? When I try printscreen, it only returns what's on the screen and anything outside the screen appears grey.

推荐答案

表单是控制，所以你应该能够全部内容复制到一个位图保存是这样的：

Forms are controls, so you should be able to save the entire contents to a bitmap with something like:

var bm = new Bitmap(yourForm.Width, yourForm.Height);
yourForm.DrawToBitmap(bm, bm.Size);
bm.Save(@"c:\whatever.gif", ImageFormat.Gif);

更新

DrawToBitmap 只汲取什么是在屏幕上。如果你想吸引你必须遍历列表列表的全部内容找到内容的大小，然后绘制每个项目。是这样的：

Update

DrawToBitmap only draws what's on-screen. If you want to draw the entire contents of the list you must iterate through the list to find the size of the contents then draw each item. Something like:

var f = yourControl.Font;
var lineHeight = f.GetHeight();

// Find size of canvas
var s = new SizeF();
using (var g = yourControl.CreateGraphics())
{
    foreach (var item in yourListBox.Items)
    {
        s.Height += lineHeight ;
        var itemWidth = g.MeasureString(item.Text, f).Width;
        if (s.Width < itemWidth)
            s.Width = itemWidth;
    }
}

using( var canvas = new Bitmap(s) )
using( var g = Graphics.FromImage(canvas) )
{
    var pt = new PointF();
    foreach (var item in yourListBox.Items)
    {
        pt.Y += lineHeight ;
        g.DrawString(item.Text, f, Brushes.Black, pt);
    }

    canvas.Save(wherever);
}

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