blocks|key|366062|text|我能想到的最好的方法是将oldFont保存到一个临时目录中，然后使用接受uri的newFont构造函数立即加载它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|366063|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 best approach I could think of, was to save the oldFont to a temp directory, and immediately load it using the newFont constructor that accepts a uri.

blocks|key|3160532|text|还有一个类似的问题here，它包含一个假设的解决方案，将System.Drawing.FontFamily转换为WPF字体系列，所有这些都在内存中，没有任何文件IO：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3160533|public+static+void+Load(MemoryStream+stream)
{
++++byte[]+streamData+=+new+byte[stream.Length];
++++stream.Read(streamData,+0,+streamData.Length);
++++IntPtr+data+=+Marshal.AllocCoTaskMem(streamData.Length);+//+Very+important.
++++Marshal.Copy(streamData,+0,+data,+streamData.Length);
++++PrivateFontCollection+pfc+=+new+PrivateFontCollection();
++++pfc.AddMemoryFont(data,+streamData.Length);
++++MemoryFonts.Add(pfc);+//+Your+own+collection+of+fonts+here.
++++Marshal.FreeCoTaskMem(data);+//+Very+important.
}

public+static+System.Windows.Media.FontFamily+LoadFont(int+fontId)
{
++++if+(!Exists(fontId))
++++{
++++++++return+null;
++++}
++++/*
++++NOTE:
++++This+is+basically+how+you+convert+a+System.Drawing.FontFamily+to+System.Windows.Media.FontFamily,+using+PrivateFontCollection.
++++*/
++++return+new+System.Windows.Media.FontFamily(MemoryFonts[fontId].Families[0].Name);
}|code-block|syntax|javascript|3160534|这似乎是使用System.Drawing.PrivateFontCollection(%5E)添加从MemoryStream创建的System.Drawing.Font，然后使用该字体的Families[0].Name传递给System.Windows.Media.FontFamily构造函数。我假设家族名称将是PrivateFontCollection中该字体实例的URI，但您可能必须尝试一下。|style|CODE|3160535|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/44912480/c-sharp-wpf-how-to-load-a-fontfamily-from-a-byte-array|1|https://docs.microsoft.com/en-us/dotnet/api/system.drawing.text.privatefontcollection?view=dotnet-plat-ext-5.0^0|9|4|0|0|0|6|10|1C|C|1R|J|2J|G|32|V|17|1|1|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|11|8|@$A|12|B|13|K|L]|$A|14|B|15|K|L]|$A|16|B|17|K|L]|$A|18|B|19|K|L]|$A|1A|B|1B|K|L]]|9|@$A|1C|B|1D|1|1E]]|C|$]]|$1|M|3|-4|5|6|7|1F|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]|U|$5|P|Q|R|C|$S|V]]]]

There is a similar question <a href="https://stackoverflow.com/questions/44912480/c-sharp-wpf-how-to-load-a-fontfamily-from-a-byte-array">here</a>, which contains a supposed solution by converting a System.Drawing.FontFamily to a WPF font family, all in memory without any file IO:
<pre><code>public static void Load(MemoryStream stream)
{
 byte[] streamData = new byte[stream.Length];
 stream.Read(streamData, 0, streamData.Length);
 IntPtr data = Marshal.AllocCoTaskMem(streamData.Length); // Very important.
 Marshal.Copy(streamData, 0, data, streamData.Length);
 PrivateFontCollection pfc = new PrivateFontCollection();
 pfc.AddMemoryFont(data, streamData.Length);
 MemoryFonts.Add(pfc); // Your own collection of fonts here.
 Marshal.FreeCoTaskMem(data); // Very important.
}

public static System.Windows.Media.FontFamily LoadFont(int fontId)
{
 if (!Exists(fontId))
 {
 return null;
 }
 /*
 NOTE:
 This is basically how you convert a System.Drawing.FontFamily to System.Windows.Media.FontFamily, using PrivateFontCollection.
 */
 return new System.Windows.Media.FontFamily(MemoryFonts[fontId].Families[0].Name);
}
</code></pre>
This seems to use the <code>System.Drawing.PrivateFontCollection</code>(<a href="https://docs.microsoft.com/en-us/dotnet/api/system.drawing.text.privatefontcollection?view=dotnet-plat-ext-5.0" rel="nofollow noreferrer">^</a>) to add a <code>System.Drawing.Font</code> created from a <code>MemoryStream</code> and then use the <code>Families[0].Name</code> of that font to pass into the <code>System.Windows.Media.FontFamily</code> constructor. I assume the family name would then be a URI to the instance of that font in the PrivateFontCollection but you'd probably have to try it out.

I have a MemoryStream with the contents of a Font File (.ttf) and I would like to be able to create a FontFamily WPF object from that stream WITHOUT writing the contents of the stream to disk. I know this is possible with a System.Drawing.FontFamily but I cannot find out how to do it with System.Windows.Media.FontFamily.
Note: I will only have the stream, so I can't pack it as a resource in the application and because of disk permissions issues, will not be able to write the font file to disk for reference as &quot;content&quot;
UPDATE:
The <a href="https://docs.microsoft.com/en-us/dotnet/api/system.windows.media.fontfamily?view=netframework-4.6.1" rel="nofollow noreferrer">API docs</a> how describe how an application resource can be used, though it is not clear to me whether that is an Embedded resource in the assembly or a file on disk.
<blockquote>
You can use a base URI value when you reference a font that is packaged as part of the application. For example, the base URI value can be a &quot;pack://application&quot; URI, which lets you reference fonts that are packaged as application resources. The following code example shows a font reference that is composed of a base URI value and a relative URI value.
</blockquote>

WPF - Load Font from Stream?

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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我有一个包含字体文件(.ttf)内容的MemoryStream，我希望能够从该流创建一个FontFamily WPF对象，而无需将流的内容写入磁盘。我知道用System.Drawing.FontFamily可以做到这一点，但是我不知道用System.Windows.Media.FontFamily怎么做。注意:我只有流...

问WPF -从流中加载字体？
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