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[Communication] C# subString understanding

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Posted on 1/31/2019 4:41:51 PM | | |
Consider the first parameter of subString(index, length) as the index starting from 1, and truncate all the previous characters at the index position, and the length represents the length of the field from the index position, and if the length is not specified, the field is intercepted to the end of the string.

The maximum length of the length is str.length-index!

--sql server
SUBSTRING(str,start,length): represents the str data source, the str count position starts from 1 by default, and the intercepted field is the length character starting from start (including start); The string intercepts the character from start to start+length-1, and if the starting position is 0, or less than 0, it completes and then intercepts the length

Instance:








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