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How do I truncate a .NET string?25个
我试过以下：
我试过以下：
var Title = LongTitle.Substring(0,20)
如果LongTitle的长度小于20,那么它可以工作,但是如果将字符串限制在最多20个字符,但是如果它们仅仅是例如5个字符长则不能得到错误.
解决方法
确保长度不会超过LongTitle(跳过空检查)：
int maxLength = Math.Min(LongTitle.Length,20); string title = LongTitle.Substring(0,maxLength);
这可以变成扩展方法：
public static class StringExtensions
{
/// <summary>
/// Truncates string so that it is no longer than the specified number of characters.
/// </summary>
/// <param name="str">String to truncate.</param>
/// <param name="length">Maximum string length.</param>
/// <returns>Original string or a truncated one if the original was too long.</returns>
public static string Truncate(this string str,int length)
{
if(length < 0)
{
throw new ArgumentOutOfRangeException("length","Length must be >= 0");
}
if (str == null)
{
return null;
}
int maxLength = Math.Min(str.Length,length);
return str.Substring(0,maxLength);
}
}
哪个可以用作：
string title = LongTitle.Truncate(20);
