blocks|key|645790|text|没有相应的运算符。您需要使用string.Format。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|645791|string+strVar+=+"stack";
string+mystr++=+string.Format("This+is+{0}soverflow",+strVar);|code-block|syntax|javascript|645792|不幸的是，string.Format是一个静态方法，所以您不能简单地编写"This+is+{0}soverflow".Format(strVar)。一些人已经定义了一个扩展方法，它允许这种语法。|645793|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.string.format.aspx^0|E|D|E|D|0|0|0|5|D|10|11|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

There is no operator for that. You need to use <a href="http://msdn.microsoft.com/en-us/library/system.string.format.aspx" rel="noreferrer"><code>string.Format</code></a>.

<pre><code>string strVar = "stack";
string mystr = string.Format("This is {0}soverflow", strVar);
</code></pre>

Unfortunately <code>string.Format</code> is a static method, so you can't simply write <code>"This is {0}soverflow".Format(strVar)</code>. Some people have defined an extension method, that allows this syntax.

blocks|key|645845|text|string+mystr+=+string.Format("This+is+{0}overflow",+strVar);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|645846|您也可以使用named+parameters而不是索引。|unstyled|offset|length|645847|entityMap|0|LINK|mutability|MUTABLE|url|http://haacked.com/archive/2009/01/04/fun-with-named-formats-string-parsing-and-edge-cases.aspx^0|0|6|G|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@$G|S|H|T|1|U]]|A|$]]|$1|I|3|-4|5|F|7|V|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

<pre><code>string mystr = string.Format("This is {0}overflow", strVar);
</code></pre>

And you could also use <a href="http://haacked.com/archive/2009/01/04/fun-with-named-formats-string-parsing-and-edge-cases.aspx" rel="noreferrer">named parameters</a> instead of indexes.

blocks|key|431629|text|使用string.Format|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|431630|string+mystr+=+string.Format("This+is+{0}overflow",+"stack");|code-block|syntax|javascript|431631|entityMap^0|2|D|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Use <code>string.Format</code>:

<pre><code>string mystr = string.Format("This is {0}overflow", "stack");
</code></pre>

blocks|key|431638|text|使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|431639|strVar+=+"stack"
mystr++=+String.Format("This+is+{0}",+strVar);|code-block|syntax|javascript|431640|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|$]]

Use:

<pre><code>strVar = "stack"
mystr = String.Format("This is {0}", strVar);
</code></pre>

blocks|key|645948|text|您应该使用String.Format()。语法略有不同，取而代之的是数字占位符。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|645949|示例：|645950|String.Format("item+{0},+item+{1}",+"one",+"two")|code-block|syntax|javascript|645951|有关更多详细信息，请查看http://msdn.microsoft.com/en-us/library/system.string.format.aspx。|645952|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.string.format.aspx^0|5|F|0|0|0|C|1T|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|D|@$9|12|A|13|1|14]]|E|$]]|$1|O|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

You should be using <code>String.Format()</code>. The syntax is a bit different, numerical placeholders are used instead.

Example:

<pre><code>String.Format("item {0}, item {1}", "one", "two")
</code></pre>

Have a look at <a href="http://msdn.microsoft.com/en-us/library/system.string.format.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.string.format.aspx</a> for more details.

blocks|key|431720|text|您有两个选项。您可以使用String.Format，也可以使用连接运算符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|431721|String+newString+=+String.Format("I+inserted+this+string+{0}+into+this+one",+oldstring);|code-block|syntax|javascript|431722|或|431723|String+newString+=+"I+inserted+this+string+"+%2B+oldstring+%2B+"+into+this+one";|431724|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]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You have 2 options. You can either use String.Format or you can use the concatenation operator. 

<pre><code>String newString = String.Format("I inserted this string {0} into this one", oldstring);
</code></pre>

OR

<pre><code>String newString = "I inserted this string " + oldstring + " into this one";
</code></pre>

blocks|key|646024|text|您可以使用string.Format将值放入字符串中：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|646025|private+static+readonly+string+formatString+=+"This+is+{0}overflow";
...
var+strVar+=+"stack";
var+myStr+=+string.Format(formatString,+"stack");|code-block|syntax|javascript|646026|另一种方法是使用C#连接运算符：|646027|var+strVar+=+"stack";
var+myStr+=+"This+is+"+%2B+strVar+%2B+"overflow";|646028|如果您正在进行大量的连接，请使用StringBuilder类，它更高效：|646029|var+strVar+=+"stack";
var+stringBuilder+=+new+StringBuilder("This+is+");
for+(;;)
{
++++stringBuilder.Append(strVar);+//+spot+the+deliberate+mistake+;-)
}
stringBuilder.Append("overflow");
var+myStr+=+stringBuilder.ToString();|646030|entityMap^0|5|D|0|0|0|0|G|D|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|S|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|T|$]]

You can use <code>string.Format</code> to drop values into strings:

<pre><code>private static readonly string formatString = "This is {0}overflow";
...
var strVar = "stack";
var myStr = string.Format(formatString, "stack");
</code></pre>

An alternative is to use the C# concatenation operator:

<pre><code>var strVar = "stack";
var myStr = "This is " + strVar + "overflow";
</code></pre>

If you're doing a lot of concatenations use the <code>StringBuilder</code> class which is more efficient:

<pre><code>var strVar = "stack";
var stringBuilder = new StringBuilder("This is ");
for (;;)
{
 stringBuilder.Append(strVar); // spot the deliberate mistake ;-)
}
stringBuilder.Append("overflow");
var myStr = stringBuilder.ToString();
</code></pre>

blocks|key|431802|text|您可以使用Expansive：https://github.com/anderly/Expansive来实现这一点|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|431803|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/anderly/Expansive^0|F|10|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]]]]

You can accomplish this with Expansive: <a href="https://github.com/anderly/Expansive" rel="nofollow">https://github.com/anderly/Expansive</a>

blocks|key|646120|text|如果您当前使用Visual+Studio2015和C#+6.0，请尝试以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|646121|var+strVar+=+"stack";

string+str+=+$"This+is+{strVar}+OverFlow";|code-block|syntax|javascript|646122|这个特性叫做字符串插值。|646123|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If you currently use Visual Studio 2015 with C# 6.0, try the following:

<pre><code>var strVar = "stack";

string str = $"This is {strVar} OverFlow";
</code></pre>

that feature is called string interpolation.

blocks|key|431887|text|C#+6.0|type|unstyled|depth|inlineStyleRanges|entityRanges|data|431888|string+mystr+=+$"This+is+{strVar}overflow";|code-block|syntax|javascript|431889|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|$]]

C# 6.0

<pre><code>string mystr = $"This is {strVar}overflow";
</code></pre>

blocks|key|646223|text|还有一种用string.Replace实现占位符的方法，在某些情况下很有帮助：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|646224|mystr+=+mystr.Replace("%25soverflow",+strVar);|code-block|syntax|javascript|646225|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|$]]

There's one more way to implement placeholders with string.Replace, oddly helps in certain situations:

<pre><code>mystr = mystr.Replace("%soverflow", strVar);
</code></pre>

blocks|key|431958|text|您可以使用美元符号和花括号。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|431959|Console.WriteLine($"Hello,+{name}!+Today+is+{date.DayOfWeek},+it's+{date:HH:mm}+now.");|code-block|syntax|javascript|431960|参见文档here。|offset|length|431961|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/tokens/interpolated^0|0|0|4|4|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

You can use the dollar sign and curl brackets.
<pre><code>Console.WriteLine($&quot;Hello, {name}! Today is {date.DayOfWeek}, it's {date:HH:mm} now.&quot;);
</code></pre>
See doc <a href="https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/tokens/interpolated" rel="nofollow noreferrer">here</a>.

I want to do the following in C# (coming from a Python background):

<pre><code>strVar = "stack"
mystr = "This is %soverflow" % (strVar)
</code></pre>

How do I replace the token inside the string with the value outside of it?

How do I interpolate strings?

Visual Studio

Python

我想在C#中做以下事情(来自Python背景)：strVar = "stack"mystr  = "This is %soverflow" % (strVar)如何将字符串内部的标记替换为字符串外部的值？

问如何对字符串进行插值？
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