blocks|key|121882|text|请尝试：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|121883|yourString.Substring(0,+5);|code-block|syntax|javascript|121884|检查C#+Substring、String.Substring+Method|offset|length|121885|entityMap|0|LINK|mutability|MUTABLE|url|http://www.google.co.in/url?sa=f&rct=j&url=http://www.dotnetperls.com/substring&q=substring%2520in%2520c#&ei=-1ZmUYySBMPprQfJ24CoBQ&usg=AFQjCNEJzDmg40WvOmut6Ei3Zn6eFBT3YQ|1|http://msdn.microsoft.com/en-us/library/system.string.substring%2528v=vs.71%2529.aspx^0|0|0|2|C|0|F|N|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@$I|X|J|Y|1|Z]|$I|10|J|11|1|12]]|A|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]|S|$5|N|O|P|A|$Q|T]]]]

Please try:

<pre><code>yourString.Substring(0, 5);
</code></pre>

Check <a href="http://www.google.co.in/url?sa=f&amp;rct=j&amp;url=http://www.dotnetperls.com/substring&amp;q=substring%20in%20c#&amp;ei=-1ZmUYySBMPprQfJ24CoBQ&amp;usg=AFQjCNEJzDmg40WvOmut6Ei3Zn6eFBT3YQ">C# Substring</a>, <a href="http://msdn.microsoft.com/en-us/library/system.string.substring%28v=vs.71%29.aspx">String.Substring Method</a>

blocks|key|121955|text|没有人提到在使用Substring()时如何进行适当的检查，所以我想对此做出贡献。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|121956|如果您不想使用Linq并使用Substring()，则必须确保字符串大于Substring()函数的第二个参数(长度)。|121957|假设您需要前5个字符。您应该通过适当的检查来获取它们，如下所示：|121958|string+title+=+"love"+//+15+characters
var+firstFiveChars+=+title.Length+<=+5+?+title+:+title.Substring(0,+5);

//+firstFiveChars:+"love"+(4+characters)|code-block|syntax|javascript|121959|如果不执行此检查，Substring()函数将抛出异常，因为它将迭代不存在的字母。|121960|我想你已经明白了.|121961|entityMap^0|8|B|0|7|4|E|B|10|B|0|0|0|9|B|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|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|14|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|15|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|16|8|@$9|17|A|18|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|19|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|T|$]]

No one mentioned how to make proper checks when using <code>Substring()</code>, so I wanted to contribute about that.

If you don't want to use <code>Linq</code> and go with <code>Substring()</code>, you have to make sure that your string is bigger than the second parameter (length) of <code>Substring()</code> function.

Let's say you need the first 5 characters. You should get them with proper check, like this:

<pre><code>string title = "love" // 15 characters
var firstFiveChars = title.Length &lt;= 5 ? title : title.Substring(0, 5);

// firstFiveChars: "love" (4 characters)
</code></pre>

Without this check, <code>Substring()</code> function would throw an exception because it'd iterate through letters that aren't there.

I think you get the idea...

blocks|key|339898|text|使用PadRight函数防止字符串太短，抓取所需内容，然后在一条语句中从末尾裁剪空格。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|339899|strSomeString+=+strSomeString.PadRight(50).Substring(0,50).TrimEnd();|code-block|syntax|javascript|339900|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 the PadRight function to prevent the string from being too short, grab what you need then trim the spaces from the end all in one statement.

<pre><code>strSomeString = strSomeString.PadRight(50).Substring(0,50).TrimEnd();
</code></pre>

blocks|key|339694|text|我不知道为什么会有人提到这个。但这是实现这一目标的最短和最简单的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|339695|string+str+=+yourString.Remove(n);|code-block|syntax|javascript|339696|n+-需要的字符数|offset|length|style|CODE|339697|示例|339698|var+zz+=+"7814148471";
Console.WriteLine(zz.Remove(5));
//result+-+78141|339699|entityMap^0|0|0|0|1|0|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]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

I don't know why anybody mentioned this.
But it's the shortest and simplest way to achieve this.

<pre><code>string str = yourString.Remove(n);
</code></pre>

<code>n</code> - number of characters that you need

Example

<pre><code>var zz = "7814148471";
Console.WriteLine(zz.Remove(5));
//result - 78141
</code></pre>

blocks|key|339747|text|追加5个空格字符，然后去掉前5个字符并修剪结果。您附加的空格数量应与您要剪切的数量相匹配。请确保在.Substring(0,X)之前包含括号，否则将不会附加任何内容。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|339748|string+str+=+(yourStringVariable+%2B+"++++").Substring(0,5).Trim();|code-block|syntax|javascript|339749|使用这种技术，您将不必担心其他答案中提到的ArgumentOutOfRangeException。|339750|entityMap^0|1D|F|0|0|L|R|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

Append five whitespace characters then cut off the first five and trim the result. The number of spaces you append should match the number you are cutting. Be sure to include the parenthesis before <code>.Substring(0,X)</code> or you'll append nothing.

<pre><code>string str = (yourStringVariable + " ").Substring(0,5).Trim();
</code></pre>

With this technique you won't have to worry about the <code>ArgumentOutOfRangeException</code> mentioned in other answers.

blocks|key|339583|text|string+str+=+"GoodMorning"

string+strModified+=+str.Substring(0,5);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|339584|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>string str = "GoodMorning"

string strModified = str.Substring(0,5);
</code></pre>

blocks|key|122127|text|从C#中的字符串中获取前n个字符|type|unstyled|depth|inlineStyleRanges|entityRanges|data|122128|String+yourstring="Some+Text";++
String+first_n_Number_of_Characters=yourstring.Substring(0,n);|code-block|syntax|javascript|122129|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|$]]

To get the first n number of characters from a string in C# 

<pre><code>String yourstring="Some Text"; 
String first_n_Number_of_Characters=yourstring.Substring(0,n);
</code></pre>

blocks|key|340005|text|在C#+8.0中，您可以获得字符串的前五个字符，如下所示|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|340006|string+str+=+data[0..5];|code-block|syntax|javascript|340007|以下是有关Indices+And+Ranges的更多信息|340008|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-8|1|https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-8#indices-and-ranges^0|1|6|0|0|0|5|I|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

In <a href="https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-8" rel="nofollow noreferrer">C# 8.0</a> you can get the first five characters of a string like so

<pre><code>string str = data[0..5];
</code></pre>

Here is some more information about <a href="https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-8#indices-and-ranges" rel="nofollow noreferrer">Indices And Ranges</a>

blocks|key|121914|text|下面是一个扩展方法，它检查字符串是否比所需的字符串大，并将字符串缩短到定义的最大字符数并追加'...‘。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|121915|public+static+class+StringExtensions
{
++++public+static+string+Ellipsis(this+string+s,+int+charsToDisplay)
++++{
++++++++if+(!string.IsNullOrWhiteSpace(s))
++++++++++++return+s.Length+<=+charsToDisplay+?+s+:+new+string(s.Take(charsToDisplay).ToArray())+%2B+"...";
++++++++return+String.Empty;
++++}
}|code-block|syntax|javascript|121916|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|$]]

Below is an extension method that checks if a string is bigger than what was needed and shortens the string to the defined max amount of chars and appends '...'.

<pre><code>public static class StringExtensions
{
 public static string Ellipsis(this string s, int charsToDisplay)
 {
 if (!string.IsNullOrWhiteSpace(s))
 return s.Length &lt;= charsToDisplay ? s : new string(s.Take(charsToDisplay).ToArray()) + "...";
 return String.Empty;
 }
}
</code></pre>

blocks|key|339972|text|当str小于5时，请尝试此代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|339973|string+strModified+=+str.Substring(0,str.Length>5?5:str.Length);|code-block|syntax|javascript|339974|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|$]]

Kindly try this code when str is less than 5. 

<pre><code>string strModified = str.Substring(0,str.Length&gt;5?5:str.Length);
</code></pre>

blocks|key|339762|text|我使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|339763|var+firstFive+=+stringValue?.Substring(0,+stringValue.Length+>=+5+?+5+:+customAlias.Length);|code-block|syntax|javascript|339764|或者，如果您还想检查是否有空格(而不仅仅是Null)：|339765|var+firstFive+=+!String.IsNullOrWhiteSpace(stringValue)+&&+stringValue.Length+>=+5+?+stringValue.Substring(0,+5)+:+stringValue|339766|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|$]]

I use:

<pre><code>var firstFive = stringValue?.Substring(0, stringValue.Length &gt;= 5 ? 5 : customAlias.Length);
</code></pre>

or alternative if you want to check for Whitespace too (instead of only Null):

<pre><code>var firstFive = !String.IsNullOrWhiteSpace(stringValue) &amp;&amp; stringValue.Length &gt;= 5 ? stringValue.Substring(0, 5) : stringValue
</code></pre>

blocks|key|339799|text|或者你可以使用String.ToCharArray()。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|339800|它将int+startindex和int+length作为参数并返回一个char[]|style|CODE|339801|new+string(stringValue.ToCharArray(0,5))|code-block|syntax|javascript|339802|您仍然需要确保字符串具有正确的长度，否则将抛出ArgumentOutOfRangeException|339803|entityMap|0|LINK|mutability|MUTABLE|url|https://msdn.microsoft.com/en-us/library/2c7h58e5(v=vs.110).aspx)^0|7|K|0|0|2|E|H|A|10|6|0|0|N|R|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@$A|11|B|12|F|G]|$A|13|B|14|F|G]|$A|15|B|16|F|G]]|9|@]|C|$]]|$1|H|3|I|5|J|7|17|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|18|8|@$A|19|B|1A|F|G]]|9|@]|C|$]]|$1|O|3|-4|5|6|7|1B|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

Or you could use <a href="https://msdn.microsoft.com/en-us/library/2c7h58e5(v=vs.110).aspx" rel="nofollow noreferrer">String.ToCharArray()</a>. 
It takes <code>int startindex</code> and and <code>int length</code> as parameters and returns a <code>char[]</code>

<pre><code>new string(stringValue.ToCharArray(0,5))
</code></pre>

You would still need to make sure the string has the proper length, otherwise it will throw a <code>ArgumentOutOfRangeException</code>

blocks|key|122208|text|如果我们只想要任何字段的前5个字符，那么这可以通过Left属性来实现|type|unstyled|depth|inlineStyleRanges|entityRanges|data|122209|Vessel+=+f.Vessel+!=null+?+f.Vessel.Left(5)+:+""|code-block|syntax|javascript|122210|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|$]]

If we want only first 5 characters from any field, then this can be achieved by Left Attribute

<pre><code>Vessel = f.Vessel !=null ? f.Vessel.Left(5) : ""
</code></pre>

blocks|key|122321|text|这就是我正在使用的，它对少于所需字符的字符串没有问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|122322|private+string+TakeFirstCharacters(string+input,+int+characterAmount)
{
++++return+input?.Substring(0,+Math.Min(input.Length,+characterAmount));
}|code-block|syntax|javascript|122323|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|$]]

This is what I am using, it has no problem with string less than required characters
<pre><code>private string TakeFirstCharacters(string input, int characterAmount)
{
 return input?.Substring(0, Math.Min(input.Length, characterAmount));
}
</code></pre>

blocks|key|340065|text|在C#+8中，您可以使用Range+Operators。为了避免在原始字符串比所需长度短时出现异常，您可以使用Math.Min|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|340066|string+newString+=+oldstring[..Math.Min(oldstring.Length,+5)];|code-block|syntax|javascript|340067|当然，如果您知道原始字符串更长，您可以进行优化：|340068|string+newString+=+oldstring[..5];|340069|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/tutorials/ranges-indexes^0|1J|8|C|F|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|13|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|14|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

In C# 8 you can use <a href="https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/tutorials/ranges-indexes" rel="nofollow noreferrer">Range Operators</a>. In order to avoid the exception if your original string is shorter than the desired length, you can use <code>Math.Min</code>:
<pre class="lang-cs prettyprint-override"><code>string newString = oldstring[..Math.Min(oldstring.Length, 5)];
</code></pre>
Of course, if you know that the original string is longer, you can optimize:
<pre class="lang-cs prettyprint-override"><code>string newString = oldstring[..5];
</code></pre>

blocks|key|121998|text|尝试下面的代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|121999|+string+Name+=+"Abhishek";
+string+firstfour+=+Name.Substring(0,+4);
+Response.Write(firstfour);|code-block|syntax|javascript|122000|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|$]]

Try below code

<pre><code> string Name = "Abhishek";
 string firstfour = Name.Substring(0, 4);
 Response.Write(firstfour);
</code></pre>

blocks|key|339728|text|我已经尝试了上面的答案，我认为最好的答案是这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|339729|@item.First_Name.Substring(0,1)|code-block|syntax|javascript|339730|在这里，我可以得到字符串的第一个字母|339731|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|$]]

I have tried the above answers and the best i think is this one

<pre><code>@item.First_Name.Substring(0,1)
</code></pre>

In this i could get the first letter of the string

I have read this <a href="https://stackoverflow.com/q/3878820/1716774">question to get first char </a> of the string. Is there a way to get the first n number of characters from a string in C#?

How to get the first five character of a String

我已经读过这个字符串的了。在C#中，有没有办法从字符串中获取前n个字符？

问如何获取字符串的前五个字符
EN

回答 17

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问如何获取字符串的前五个字符
EN