C# 拆分字符串并仅获取第一个值
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Split string and get first value only
提问by 3D-kreativ
I wonder if it's possible to use split to devide a string with several parts that are separated with a comma, like this:
我想知道是否可以使用 split 来划分一个字符串，其中包含几个用逗号分隔的部分，如下所示：
title, genre, director, actor
I just want the first part, the title of each string and not the rest?
我只想要第一部分，每个字符串的标题而不是其余部分？
采纳答案by bhupendra patel
string valueStr = "title, genre, director, actor";
var vals = valueStr.Split(',')[0];
vals will give you the title
vals 会给你标题
回答by SimpleVar
Actually, there is a better way to do it than split:
实际上，有比拆分更好的方法：
public string GetFirstFromSplit(string input, char delimiter)
{
var i = input.IndexOf(delimiter);
return i == -1 ? input : input.Substring(0, i);
}
And as extension methods:
并作为扩展方法：
public static string FirstFromSplit(this string source, char delimiter)
{
var i = source.IndexOf(delimiter);
return i == -1 ? source : source.Substring(0, i);
}
public static string FirstFromSplit(this string source, string delimiter)
{
var i = source.IndexOf(delimiter);
return i == -1 ? source : source.Substring(0, i);
}
Usage:
用法：
string result = "hi, hello, sup".FirstFromSplit(',');
Console.WriteLine(result); // "hi"
回答by Ivo
You can do it:
你能行的：
var str = "Doctor Who,Fantasy,Steven Moffat,David Tennant";
var title = str.Split(',').First();
Also you can do it this way:
你也可以这样做：
var index = str.IndexOf(",");
var title = index < 0 ? str : str.Substring(0, index);
回答by Vityata
These are the two options I managed to build, not having the luxury of working with vartype, nor with additional variables on the line:
这是我设法构建的两个选项，没有使用var类型的奢侈，也没有在线上的附加变量：
string f = "aS.".Substring(0, "aS.".IndexOf("S"));
Console.WriteLine(f);
string s = "aS.".Split("S".ToCharArray(),StringSplitOptions.RemoveEmptyEntries)[0];
Console.WriteLine(s);
This is what it gets:
这是它得到的：
