C# 如何插入字符串？
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How do I interpolate strings?
提问by sazr
I want to do the following in C# (coming from a Python background):
我想在 C# 中执行以下操作（来自 Python 背景）：
strVar = "stack"
mystr = "This is %soverflow" % (strVar)
How do I replace the token inside the string with the value outside of it?
如何用字符串外部的值替换字符串内部的标记？
采纳答案by Darin Dimitrov
string mystr = string.Format("This is {0}overflow", strVar);
And you could also use named parametersinstead of indexes.
你也可以使用命名参数而不是索引。
回答by CodesInChaos
There is no operator for that. You need to use string.Format.
没有运营商。您需要使用string.Format.
string strVar = "stack";
string mystr = string.Format("This is {0}soverflow", strVar);
Unfortunately string.Formatis a static method, so you can't simply write "This is {0}soverflow".Format(strVar). Some people have defined an extension method, that allows this syntax.
不幸的string.Format是，它是一个静态方法，因此您不能简单地编写"This is {0}soverflow".Format(strVar). 有些人定义了一个扩展方法，允许使用这种语法。
回答by Matthew Abbott
Use string.Format:
使用string.Format：
string mystr = string.Format("This is {0}overflow", "stack");
回答by Phillip Ngan
Use:
用：
strVar = "stack"
mystr = String.Format("This is {0}", strVar);
回答by Bruno Silva
You should be using String.Format(). The syntax is a bit different, numerical placeholders are used instead.
你应该使用String.Format(). 语法有点不同，而是使用数字占位符。
Example:
例子：
String.Format("item {0}, item {1}", "one", "two")
Have a look at http://msdn.microsoft.com/en-us/library/system.string.format.aspxfor more details.
有关更多详细信息，请查看http://msdn.microsoft.com/en-us/library/system.string.format.aspx。
回答by DwayneAllen
You have 2 options. You can either use String.Format or you can use the concatenation operator.
您有 2 个选择。您可以使用 String.Format，也可以使用连接运算符。
String newString = String.Format("I inserted this string {0} into this one", oldstring);
OR
或者
String newString = "I inserted this string " + oldstring + " into this one";
回答by David Clarke
You can use string.Formatto drop values into strings:
您可以使用string.Format将值放入字符串中：
private static readonly string formatString = "This is {0}overflow";
...
var strVar = "stack";
var myStr = string.Format(formatString, "stack");
An alternative is to use the C# concatenation operator:
另一种方法是使用 C# 连接运算符：
var strVar = "stack";
var myStr = "This is " + strVar + "overflow";
If you're doing a lot of concatenations use the StringBuilderclass which is more efficient:
如果您要进行大量连接，请使用StringBuilder效率更高的类：
var strVar = "stack";
var stringBuilder = new StringBuilder("This is ");
for (;;)
{
stringBuilder.Append(strVar); // spot the deliberate mistake ;-)
}
stringBuilder.Append("overflow");
var myStr = stringBuilder.ToString();
回答by anderly
You can accomplish this with Expansive: https://github.com/anderly/Expansive
您可以使用 Expansive 完成此操作：https: //github.com/anderly/Expansive
回答by Ashtonian
This has been added as of C# 6.0 (Visual Studio 2015+).
这已从 C# 6.0 (Visual Studio 2015+) 开始添加。
Example:
例子：
var planetName = "Bob";
var myName = "Ford";
var formattedStr = $"Hello planet {planetName}, my name is {myName}!";
// formattedStr should be "Hello planet Bob, my name is Ford!"
This is syntactic sugar for:
这是语法糖：
var formattedStr = String.Format("Hello planet {0}, my name is {1}!", planetName, myName);
Additional Resources:
其他资源：
回答by Sakal
If you currently use Visual Studio 2015 with C# 6.0, try the following:
如果您当前使用的是带有 C# 6.0 的 Visual Studio 2015，请尝试以下操作：
var strVar = "stack";
string str = $"This is {strVar} OverFlow";
that feature is called string interpolation.
该功能称为字符串插值。
