Streamwriter/Textwriter中特定的字符串长度(作为txt文件) [英] specific string length in streamwriter/textwriter as txt file

问题描述

我的数据行检索一个字符串长度不知道，我的代码是:

my data row retrieve one row string length don''t know,my code is :

string s="";
//s store retrieve data value.
streamwriter sw;
sw.writeline(s.substring(0,s.length<=30))

但这是错误的.
我想根据数据检索显示30个字符或少于30个字符，但我想为打印dmp打印机dos(例如销售账单或发票打印)写30个字符或少于30个字符.任何人都可以帮助我，我新学习了C#.

如果我的检索字符串长度为20，则余下的10个字符显示为Blanck.例如mystring + 10个字符是Blanck = 30个字符长的字符串.它用于数据表行格式

下面的代码不起作用

but it''s error.
I want show the character 30 or less than 30 as per data retrieve but I want to write 30 or less than 30 character for print dmp printer dos like,sales bill or invoice print.any one help me, I new learn c#.

if my retrieve string length is 20 the balance 10 character show Blanck. like mystring+10 character is Blanck = 30 character length string.It use in datatable rows format

below code not working

private string GetFormatedText(string Cont,int Length)
        {
            int rLoc=Length-Cont.Length;
            if(rLoc<0)
            {
                Cont =Cont.Substring(0,Length);
            }
            else
            {
                int nos;
                for(nos=0;nos               Cont =Cont +" ";
            }
            return(Cont);
}

推荐答案

解决方案非常简单:从一开始就开始阅读基本语言手册.您真的需要它.
看起来您对语法不太了解，可能对参数，对象等也不太了解.首先，语法区分大小写.必须为s.Substring(0, 30).像s.Length<=30这样的东西是布尔表达式.您只能在需要布尔参数的地方使用它；也应该在if，while等中使用.

http://msdn.microsoft.com/en-us/library/aka44szs.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/kx37x362.aspx [ ^ ].

—SA

The solution is very simple: start reading elementary language manual from the very beginning. You really needs it.
It looks like you have a very little idea of the syntax, and probably about parameters, objects, etc. First of all, the syntax is case-sensitive. Must be s.Substring(0, 30). A thing like s.Length<=30 is a Boolean expression; you can only use it where Boolean parameter is expected; it is also expected in if, while, etc.

http://msdn.microsoft.com/en-us/library/aka44szs.aspx[^],
http://msdn.microsoft.com/en-us/library/kx37x362.aspx[^].

—SA

如果我理解正确，您最多希望显示30个字符.
为此，您需要进行一些小的更改

If I understand correctly, you want to show up to a maximum of 30 characters.
To do that you have to make a small change

if(s.length <= 30)
   sw.writeline(s);
else
   sw.writeline(s.substring(0,30));

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