blocks|key|2148460|text|使用GDI%2B，您可以使用较高的笔宽值绘制一个圆，使其看起来像一个圆环。中心不会有任何东西，所以你可以透过它看到。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2148461|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|$]]

Using GDI+, you can draw a circle with a high value for the pen width, to make it look like a donut. There will be nothing in the centre so you'll be able to see through it.

blocks|key|2148507|text|您可以创建一个基于使用FillEllipse绘制的区域，并使用该区域的Exclude方法通过使用从另一次调用FillEllipse返回的另一个GraphicsPath来删除不需要的区域。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2148508|然后，您只需将生成的区域覆盖在您希望其周围的区域之上。|2148509|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

You could create a Region that is based on what you would have drawn using the FillEllipse and the use the Exclude method of the Region to remove areas that you don't want by using another GraphicsPath returned from another call to FillEllipse.

Then you would just have to overlay the resulting Region on top of what you want it to surround.

blocks|key|635828|text|//+Create+a+brush
SolidBrush+b+=+new+SolidBrush(Color.Blue);

//+Clear+your+Graphics+object+(defined+externally)
gfx.Clear(Color.White);

//+You+need+a+path+for+the+outer+and+inner+circles
GraphicsPath+path1+=+new+GraphicsPath();
GraphicsPath+path2+=+new+GraphicsPath();

//+Define+the+paths+(where+X,+Y,+and+D+are+chosen+externally)
path1.AddEllipse((float)(X+-+D+/+2),+(float)(Y+-+D+/+2),+(float)D,+(float)D);
path2.AddEllipse((float)(X+-+D+/+4),+(float)(Y+-+D+/+4),+(float)(D+/+2),+(float)(D+/+2));

//+Create+a+region+from+the+Outer+circle.
Region+region+=+new+Region(path1);

//+Exclude+the+Inner+circle+from+the+region
region.Exclude(path2);

//+Draw+the+region+to+your+Graphics+object
gfx.FillRegion(b,+region);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|635829|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>// Create a brush
SolidBrush b = new SolidBrush(Color.Blue);

// Clear your Graphics object (defined externally)
gfx.Clear(Color.White);

// You need a path for the outer and inner circles
GraphicsPath path1 = new GraphicsPath();
GraphicsPath path2 = new GraphicsPath();

// Define the paths (where X, Y, and D are chosen externally)
path1.AddEllipse((float)(X - D / 2), (float)(Y - D / 2), (float)D, (float)D);
path2.AddEllipse((float)(X - D / 4), (float)(Y - D / 4), (float)(D / 2), (float)(D / 2));

// Create a region from the Outer circle.
Region region = new Region(path1);

// Exclude the Inner circle from the region
region.Exclude(path2);

// Draw the region to your Graphics object
gfx.FillRegion(b, region);
</code></pre>

blocks|key|2148535|text|基于user263134答案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2148536|++++g.FillRegion(Brushes.Black,+GetRingRegion(center,+innerRadius,+outherRadius));

++++public+static+RectangleF+GetRectangle(PointF+center,+float+radius)
++++{
++++++++var+rectangle+=+new+RectangleF(center.X+-+radius,+center.Y+-+radius,radius+*+2,+radius+*+2);
++++++++return+rectangle;
++++}

++++public+static+Region+GetRingRegion(PointF+center,+float+innerRadius,+float+outherRadius)
++++{
++++++++//+You+need+a+path+for+the+outer+and+inner+circles
++++++++var+path1+=+new+GraphicsPath();
++++++++var+path2+=+new+GraphicsPath();

++++++++//+Define+the+paths+(where+X,+Y,+and+D+are+chosen+externally)
++++++++path1.AddEllipse(GetRectangle(center,outherRadius));
++++++++path2.AddEllipse(GetRectangle(center,+innerRadius));

++++++++//+Create+a+region+from+the+Outer+circle.
++++++++Region+region+=+new+Region(path1);

++++++++//+Exclude+the+Inner+circle+from+the+region
++++++++region.Exclude(path2);

++++++++return+region;
++++}|code-block|syntax|javascript|2148537|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|$]]

Based on user263134 answer:

<pre><code> g.FillRegion(Brushes.Black, GetRingRegion(center, innerRadius, outherRadius));

 public static RectangleF GetRectangle(PointF center, float radius)
 {
 var rectangle = new RectangleF(center.X - radius, center.Y - radius,radius * 2, radius * 2);
 return rectangle;
 }

 public static Region GetRingRegion(PointF center, float innerRadius, float outherRadius)
 {
 // You need a path for the outer and inner circles
 var path1 = new GraphicsPath();
 var path2 = new GraphicsPath();

 // Define the paths (where X, Y, and D are chosen externally)
 path1.AddEllipse(GetRectangle(center,outherRadius));
 path2.AddEllipse(GetRectangle(center, innerRadius));

 // Create a region from the Outer circle.
 Region region = new Region(path1);

 // Exclude the Inner circle from the region
 region.Exclude(path2);

 return region;
 }
</code></pre>

blocks|key|2148601|text|'sth‘的答案就是你需要的，但是你可以很容易地使用：(Graphics).DrawEllipse(new+Pen(YOURCOLOR，RINGDIAMETER)，center.x+-+radius，center.y+-+radius，radius+*+2，radius+*+2)；但我想你以前就知道这一点。:)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2148602|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|$]]

The answer of 'sth' is pretty much what you need, but dude you can easily just use:
(Graphics).DrawEllipse(new Pen(YOURCOLOR, RINGDIAMETER), center.x - radius, center.y - radius, radius * 2, radius * 2);
But i think you knew this before. :)

blocks|key|739800|text|来自某物的答案中有一件很重要的事情，这是最灵活的答案，那就是需要处理GraphicsPath和Brush，因此将它们的声明放在using语句中，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|739801|//+Clear+your+Graphics+object+(defined+externally)
gfx.Clear(Color.White);

//+You+need+a+path+for+the+outer+and+inner+circles
using+(GraphicsPath+path1+=+new+GraphicsPath(),+path2+=+new+GraphicsPath())
++{
++//+Define+the+paths+(where+X,+Y,+and+D+are+chosen+externally)
++path1.AddEllipse((float)(X+-+D+/+2),+(float)(Y+-+D+/+2),+(float)D,+(float)D);
++path2.AddEllipse((float)(X+-+D+/+4),+(float)(Y+-+D+/+4),+(float)(D+/+2),+(float)(D+/+2));

++//+Create+a+region+from+the+Outer+circle.
++Region+region+=+new+Region(path1);

++//+Exclude+the+Inner+circle+from+the+region
++region.Exclude(path2);

++//+Create+a+brush
++using+(SolidBrush+b+=+new+SolidBrush(Color.Blue))
++++{
++++//+Draw+the+region+to+your+Graphics+object
++++gfx.FillRegion(b,+region);
++++}
++}|code-block|syntax|javascript|739802|这将确保在不再需要它们时将其丢弃。|739803|使用是确保Dispose方法即使在发生异常时也会被调用的最佳方式。|739804|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

One important thing with the answer from sth, which is the most flexible answer, is that GraphicsPath and Brush need to be disposed so put their declaration in a using statement as follows:

<pre><code>// Clear your Graphics object (defined externally)
gfx.Clear(Color.White);

// You need a path for the outer and inner circles
using (GraphicsPath path1 = new GraphicsPath(), path2 = new GraphicsPath())
 {
 // Define the paths (where X, Y, and D are chosen externally)
 path1.AddEllipse((float)(X - D / 2), (float)(Y - D / 2), (float)D, (float)D);
 path2.AddEllipse((float)(X - D / 4), (float)(Y - D / 4), (float)(D / 2), (float)(D / 2));

 // Create a region from the Outer circle.
 Region region = new Region(path1);

 // Exclude the Inner circle from the region
 region.Exclude(path2);

 // Create a brush
 using (SolidBrush b = new SolidBrush(Color.Blue))
 {
 // Draw the region to your Graphics object
 gfx.FillRegion(b, region);
 }
 }
</code></pre>

This will ensure that they are disposed when they are no longer needed.

The using is the best way to ensure that the Dispose method is called even when an exception occurs.

So like a graphics.FillEllipse, but with a hole in the middle. I need to highlight some circular icons by putting a ring around them, and due to the constraints of the larger program it's hard/impossible to simply FillEllipse under them to make it look like there's a hole.

Any way to easily draw a hollow donut shape in C#

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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就像graphics.FillEllipse一样，但中间有个洞。我需要通过在它们周围放一个环来突出显示一些圆形图标，并且由于较大程序的限制，很难/不可能简单地在它们下面使用FillEllipse来使其看起来像是有一个洞。

问在C#中轻松绘制空心甜甜圈形状的任何方法
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问在C#中轻松绘制空心甜甜圈形状的任何方法EN