Question

我有一个大字符串，它存储在一个字符串变量str中。我想从c＃中得到一个子串？假设字符串是：" Retrieves a substring from this instance. The substring starts at a specified character position."

我希望显示的子串结果是：The substring starts at a specified character position.

Answer 1

您可以手动或使用IndexOf方法执行此操作。

手动：

int index = 43;
string piece = myString.Substring(index);

使用IndexOf，您可以看到fullstop的位置：

int index = myString.IndexOf(".") + 1;
string piece = myString.Substring(index);

Answer 2

string newString = str.Substring(0,10)

将为您提供前10个字符（从位置0到位置9）。

见here。

Answer 3

以下是从14个字符到字符串结尾的子字符串的示例。您可以修改它以满足您的需求

string text = "Retrieves a substring from this instance. The substring starts at a specified character position.";
//get substring where 14 is start index
string substring = text.Substring(14);

Answer 4

日亚

假设您想要在句号（。）上进行拆分，那么这是一种可以捕获所有出现的方法：

// add @ to the string to allow split over multiple lines 
// (display purposes to save scroll bar appearing on SO question :))
string strBig = @"Retrieves a substring from this instance. 
            The substring starts at a specified character position. great";

// split the string on the fullstop, if it has a length>0
// then, trim that string to remove any undesired spaces
IEnumerable<string> subwords = strBig.Split('.')
    .Where(x => x.Length > 0).Select(x => x.Trim());

// iterate around the new 'collection' to sanity check it
foreach (var subword in subwords)
{
    Console.WriteLine(subword);
}

...享受

Answer 5

string text = "Retrieves a substring from this instance. The substring starts at a specified character position. Some other text";

string result = text.Substring(text.IndexOf('.') + 1,text.LastIndexOf('.')-text.IndexOf('.'))

这将切断位于特殊字符之间的字符串部分。

Answer 6

var data =" Retrieves a substring from this instance. The substring starts at a specified character position.";

var result = data.Split(new[] {'.'}, 1)[0];

输出：

从此实例中检索子字符串。子串从a开始指定的角色位置。

Answer 7

it's easy to rewrite this code in C#...

如果您的值在2个子串之间，则此方法有效！

例如：

stringContent = "[myName]Alex[myName][color]red[color][etc]etc[etc]"

应该是：

myNameValue = SplitStringByASubstring(stringContent , "[myName]")

colorValue = SplitStringByASubstring(stringContent , "[color]")

etcValue = SplitStringByASubstring(stringContent , "[etc]")

如何从c＃中的字符串中获取子字符串？

7 个答案: