C# 如何将单个字符转换为字符串？
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How do I convert a single char to a string?
提问by Ian R. O'Brien
I'd like to enumerate a stringand instead of it returning charsI'd like to have the iterative variable be of type string. This probably isn't possible to have the iterative type be a stringso what is the most efficient way to iterate through this string?
我想枚举 astring而不是它返回chars我想让迭代变量的类型为string。这可能不可能让迭代类型成为 astring那么迭代这个字符串的最有效方法是什么？
Do I need to create a new stringobject with each iteration of the loop or can I perform a cast somehow?
我是否需要string在循环的每次迭代中创建一个新对象，或者我可以以某种方式执行强制转换？
String myString = "Hello, World";
foreach (Char c in myString)
{
// what I want to do in here is get a string representation of c
// but I can't cast expression of type 'char' to type 'string'
String cString = (String)c; // this will not compile
}
采纳答案by Mark Hall
Use the .ToString() Method
使用 .ToString() 方法
String myString = "Hello, World";
foreach (Char c in myString)
{
String cString = c.ToString();
}
回答by Ian R. O'Brien
It seems that the obvious thing to do is this:
似乎显而易见的事情是这样的：
String cString = c.ToString()
回答by Michael G
Create a new string from the char.
从字符创建一个新字符串。
String cString = new String(new char[] { c });
or
或者
String cString = c.ToString();
回答by trebuchet
Did you try:
你试过了吗：
String s = new String(new char[] { 'c' });
String s = new String(new char[] { 'c' });
回答by Jeroen
String cString = c.ToString();
回答by Lukasz Madon
You have two options. Create a stringobject or call ToStringmethod.
你有两个选择。创建string对象或调用ToString方法。
String cString = c.ToString();
String cString2 = new String(c, 1); // second parameter indicates
// how many times it should be repeated
回答by horgh
Create an extension method:
创建扩展方法：
public static IEnumerable<string> GetCharsAsStrings(this string value)
{
return value.Select(c =>
{
//not good at all, but also a working variant
//return string.Concat(c);
return c.ToString();
});
}
and loop through strings:
并循环遍历字符串：
string s = "123456";
foreach (string c in s.GetCharsAsStrings())
{
//...
}
回答by user1489240
Why not this code? Won't it be faster?
为什么不是这个代码？不会更快吗？
string myString = "Hello, World";
foreach( char c in myString )
{
string cString = new string( c, 1 );
}
回答by sean
With C# 6 interpolation:
使用 C# 6 插值：
char ch = 'A';
string s = $"{ch}";
This shaves a few bytes. :)
这会减少几个字节。:)
回答by Jim Balter
probably isn't possible to have the iterative type be a string
可能不可能将迭代类型设为字符串
Sure it is:
就是这样：
foreach (string str in myString.Select(c => c.ToString())
{
...
}
Any of the suggestions in the other answers can be substituted for c.ToString(). Probably the most efficient by a small hair is c => new string(c, 1), which is what char.ToString()probably does under the hood.
其他答案中的任何建议都可以替换为c.ToString()。可能最有效的小毛是c => new string(c, 1)，这char.ToString()可能是引擎盖下所做的。
