blocks|key|2742598|text|将Image+property设置为null就可以了。它将清除图片框中当前显示的任何图像。确保您编写的代码完全像这样：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2742599|picBox.Image+=+null;|code-block|syntax|javascript|2742600|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.windows.forms.picturebox.image.aspx^0|1|5|1|E|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

Setting the <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.picturebox.image.aspx" rel="noreferrer"><code>Image</code> property</a> to null will work just fine. It will clear whatever image is currently displayed in the picture box. Make sure that you've written the code exactly like this:

<pre><code>picBox.Image = null;
</code></pre>

blocks|key|2532731|text|正如其他人所说，将Image属性设置为null应该是可行的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2532732|如果没有，这可能意味着您使用了InitialImage属性来显示图像。如果确实是这样，请尝试将该属性设置为null：|2532733|pictBox.InitialImage+=+null;|code-block|syntax|javascript|2532734|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.windows.forms.picturebox.initialimage.aspx^0|9|5|J|4|0|1H|4|F|C|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@$9|12|A|13|1|14]]|E|$]]|$1|H|3|I|5|J|7|15|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

As others have said, setting the <code>Image</code> property to <code>null</code> should work.

If it doesn't, it might mean that you used the <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.picturebox.initialimage.aspx">InitialImage</a> property to display your image. If that's indeed the case, try setting that property to <code>null</code> instead:

<pre><code>pictBox.InitialImage = null;
</code></pre>

blocks|key|2532757|text|我假设您想要清除通过PictureBox绘制的图像。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2532758|这可以通过一个Bitmap对象和使用Graphics对象来实现。你可能正在做类似这样的事情|2532759|Graphics+graphic+=+Graphics.FromImage(pictbox.Image);
graphic.Clear(Color.Red)+//Color+to+fill+the+background+and+reset+the+box|code-block|syntax|javascript|2532760|这就是你要找的东西吗？|2532761|编辑|offset|length|style|BOLD|2532762|由于您使用的是paint方法，这将导致它每次都会被重新绘制，我建议您在窗体级别设置一个标志，指示它是否应该绘制Picturebox|2532763|private+bool+_shouldDraw+=+true;
public+bool+ShouldDraw
{
++++get+{+return+_shouldDraw;+}
++++set+{+_shouldDraw+=+value;+}
}|2532764|在你的油漆中使用|2532765|if(ShouldDraw)
++//do+your+stuff|2532766|当您单击该按钮时，将此属性设置为false，您就可以正常工作了。|2532767|entityMap^0|0|0|0|0|0|2|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|15|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|16|8|@$M|17|N|18|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|19|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|1A|8|@]|9|@]|A|$G|H]]|$1|U|3|V|5|6|7|1B|8|@]|9|@]|A|$]]|$1|W|3|X|5|F|7|1C|8|@]|9|@]|A|$G|H]]|$1|Y|3|Z|5|6|7|1D|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|11|$]]

I assume you want to clear the Images drawn via PictureBox.

This you would be achieved via a Bitmap object and using Graphics object. you might be doing something like

<pre><code>Graphics graphic = Graphics.FromImage(pictbox.Image);
graphic.Clear(Color.Red) //Color to fill the background and reset the box
</code></pre>

Is this what you were looking out?

EDIT

Since you are using the paint method this would cause it to be redrawn every time, I would suggest you to set a flag at the formlevel indicating whether it should or not paint the Picturebox

<pre><code>private bool _shouldDraw = true;
public bool ShouldDraw
{
 get { return _shouldDraw; }
 set { _shouldDraw = value; }
}
</code></pre>

In your paint just use 

<pre><code>if(ShouldDraw)
 //do your stuff
</code></pre>

When you click the button set this property to false and you should be fine.

blocks|key|51534|text|private+void+ClearBtn_Click(object+sender,+EventArgs+e)
{
++++Studentpicture.Image+=+null;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|51535|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>private void ClearBtn_Click(object sender, EventArgs e)
{
 Studentpicture.Image = null;
}
</code></pre>

blocks|key|50909|text|我也有一个顽固的图像，它不会通过将图像和InitialImage设置为null而消失。为了从pictureBox中永久删除图像，我必须通过重复调用Application.DoEvents()来使用下面的代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|50910|++++++++++++Application.DoEvents();
++++++++++++if+(_pictureBox.Image+!=+null)
++++++++++++++++_pictureBox.Image.Dispose();
++++++++++++_pictureBox.Image+=+null;
++++++++++++Application.DoEvents();
++++++++++++if+(_pictureBox.InitialImage+!=+null)
++++++++++++++++_pictureBox.InitialImage.Dispose();
++++++++++++_pictureBox.InitialImage+=+null;
++++++++++++_pictureBox.Update();
++++++++++++Application.DoEvents();
++++++++++++_pictureBox.Refresh();|code-block|syntax|javascript|50911|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I've had a stubborn image too, that wouldn't go away 
by setting the Image and InitialImage to null.
To remove the image from the pictureBox for good, I had to use the code below,
by calling Application.DoEvents() repeatedly:

<pre><code> Application.DoEvents();
 if (_pictureBox.Image != null)
 _pictureBox.Image.Dispose();
 _pictureBox.Image = null;
 Application.DoEvents();
 if (_pictureBox.InitialImage != null)
 _pictureBox.InitialImage.Dispose();
 _pictureBox.InitialImage = null;
 _pictureBox.Update();
 Application.DoEvents();
 _pictureBox.Refresh();
</code></pre>

blocks|key|2742707|text|if+(pictureBox1.Image+!=+null)
{
++++pictureBox1.Image.Dispose();
++++pictureBox1.Image+=+null;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2742708|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>if (pictureBox1.Image != null)
{
 pictureBox1.Image.Dispose();
 pictureBox1.Image = null;
}
</code></pre>

blocks|key|2742724|text|我必须在Image+=+null之后添加一个Refresh()语句才能正常工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2742725|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I had to add a Refresh() statement after the Image = null to make things work.

blocks|key|2742730|text|你应该试试。清除图形时，必须选择颜色。SystemColors.Control是窗体的原生颜色|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2742731|Graphics+g+=+pB.CreateGraphics();
g.Clear(SystemColors.Control);|code-block|syntax|javascript|2742732|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You should try. When you clear your Graphics you must choose color. SystemColors.Control is native color of form

<pre><code>Graphics g = pB.CreateGraphics();
g.Clear(SystemColors.Control);
</code></pre>

blocks|key|50199|text|您需要以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|50200|pictbox.Image+=+null;
pictbox.update();|code-block|syntax|javascript|50201|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You need the following:

<pre><code>pictbox.Image = null;
pictbox.update();
</code></pre>

blocks|key|2742753|text|这太简单了！您可以使用按钮单击事件，我将其与一个按钮属性名称一起使用："btnClearImage“|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2742754|//+Note+1a:
//+after+clearing+the+picture+box+
//+you+can+also+disable+clear+button+
//+by+inserting+follwoing+one+line+of+code:

btnClearImage.Enabled+=+false+++

//+Note+1b:
//+you+should+set+your+button+Enabled+property
//+to+"False"
//+after+that+you+will+need+to+Insert+
//+the+following+line+to+concerned+event+or+button
//+that+load+your+image+into+picturebox1+
//+code+line+is+as+follows:

btnClearImage.Enabled+=+true;|code-block|syntax|javascript|2742755|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Its so simple!
You can go with your button click event,
I used it with a button property Name: "btnClearImage"

<pre><code>// Note 1a:
// after clearing the picture box 
// you can also disable clear button 
// by inserting follwoing one line of code:

btnClearImage.Enabled = false 

// Note 1b:
// you should set your button Enabled property
// to "False"
// after that you will need to Insert 
// the following line to concerned event or button
// that load your image into picturebox1 
// code line is as follows:

btnClearImage.Enabled = true;
</code></pre>

blocks|key|50625|text|clear+pictureBox+in+c#+winform+Application在c#+winform应用程序中清除pictureBox的简单方法|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|50626|entityMap|0|LINK|mutability|MUTABLE|url|https://i.stack.imgur.com/eeZsc.png^0|0|16|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

<a href="https://i.stack.imgur.com/eeZsc.png" rel="nofollow noreferrer">clear pictureBox in c# winform Application</a>
Simple way to clear pictureBox in c# winform Application

blocks|key|51585|text|我使用此方法从picturebox中清除图像。可能会对某些人有所帮助|type|unstyled|depth|inlineStyleRanges|entityRanges|data|51586|private+void+btnClear1_Click(object+sender,+EventArgs+e)
++++++++{

++++++++++++img1.ImageLocation+=+null;
++++++++}|code-block|syntax|javascript|51587|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I used this method to clear the image from picturebox. It may help some one

<pre><code>private void btnClear1_Click(object sender, EventArgs e)
 {

 img1.ImageLocation = null;
 }
</code></pre>

blocks|key|2532939|text|为了理解：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2532940|根据您实现目标的方式，请记住，开发人员有责任处理不再使用或不再需要的所有内容。|2532941|这意味着：你已经创建的所有东西和你的pictureBox+(即:图形，列表等)将在不再需要的时候被丢弃。|offset|length|style|BOLD|2532942|例如，：假设你有一个图像文件加载到你的PictureBox中，你想以某种方式删除该文件。如果您没有正确地从PictureBox卸载图像文件，您将无法删除该文件，因为这可能会抛出一个异常，表明该文件正在被使用。|2532943|因此，您需要执行以下操作：：|2532944|pic_PhotoDisplay.Image.Dispose();
pic_PhotoDisplay.Image+=+null;
pic_PhotoDisplay.ImageLocation+=+null;
//+Required+if+you've+drawn+something+in+the+PictureBox.+Just+Don't+forget+to+Dispose+Graphic.
pic_PhotoDisplay.Update();

//+Depending+on+your+approach;+Dispose+the+Graphics+with+Something+Like:
gfx+=+null;
gfx.Clear();
gfx.Dispose();|code-block|syntax|javascript|2532945|希望这能帮到你。|2532946|entityMap^0|0|0|0|5|0|3|1|0|0|0|0|8|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Y|8|@$F|Z|G|10|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|11|8|@$F|12|G|13|H|I]]|9|@]|A|$]]|$1|L|3|M|5|6|7|14|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|15|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|16|8|@$F|17|G|18|H|I]]|9|@]|A|$]]|$1|U|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|V|$]]

For the Sake of Understanding:
Depending on how you're approaching your objective(s), keep in mind that the developer is responsible to Dispose everything that is no longer being used or necessary.
This means: Everything you've created along with your pictureBox (i.e: Graphics, List; etc) shall be disposed whenever it is no longer necessary.
For Instance:
Let's say you have a Image File Loaded into your PictureBox, and you wish to somehow Delete that file.
If you don't unload the Image File from PictureBox correctly; you won't be able to delete the file, as this will likely throw an Exception saying that the file is being used.
Therefore you'd be required to do something like:
<pre><code>pic_PhotoDisplay.Image.Dispose();
pic_PhotoDisplay.Image = null;
pic_PhotoDisplay.ImageLocation = null;
// Required if you've drawn something in the PictureBox. Just Don't forget to Dispose Graphic.
pic_PhotoDisplay.Update();

// Depending on your approach; Dispose the Graphics with Something Like:
gfx = null;
gfx.Clear();
gfx.Dispose();
</code></pre>
Hope this helps you out.

How can I clear draw image on picturebox?
The following doesn't help me:

<pre><code>pictbox.Image = null;
pictbox.Invalidate();
</code></pre>

Please help.

EDIT

<pre><code>private void pictbox_Paint(object sender, PaintEventArgs e) 
{ 
 Graphics g = e.Graphics; 
 vl.Draw(g, ref tran.realListForInsert); 
} 

public void Draw(Graphics g, ref List&lt;double&gt; arr) 
{ 
 g.DrawRectangle(new Pen(Brushes.Red, 3), nodeArr[Convert.ToInt32(templstName)].pict.Location.X, nodeArr[Convert.ToInt32(templstName)].pict.Location.Y, 25, 25); 
 g.DrawRectangle(new Pen(Brushes.Green, 3), nodeArr[Convert.ToInt32(templstArgName)].pict.Location.X, nodeArr[Convert.ToInt32(templstArgName)].pict.Location.Y, 25, 25); 
 nodeArr[Convert.ToInt32(templstName)].text.Text = arr[Convert.ToInt32(templstArgName)].ToString(); 
 arr[Convert.ToInt32(templstName)] = arr[Convert.ToInt32(templstArgName)]; 
} 
</code></pre>

Clear image on picturebox

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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如何清除在picturebox上绘制图像？以下内容对我没有帮助：pictbox.Image = null;pictbox.Invalidate();请帮帮忙。编辑private void pictbox_Paint(object sender, PaintEventArgs e) {      Graphics g =...

问清除picturebox上的图像
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