[英]String.Join is not working with AppendAllText (C#)
I have below string 我有下面的字符串
string str= "Insert into " + tname + "(id, t, v) values(" + lc+ ", " + mc+ ", " + rc+");" + Environment.NewLine;
and I'm write it to file: 然后将其写入文件:
File.AppendAllText(fileName, str);
It's working. 工作正常
I also tried to use string.Join : 我也尝试使用string.Join :
string str = string.Join("Insert into " + tname+ "(id, t, v) values(" + lc+ ", " + mc+ ", " + rc+ ");", Environment.NewLine);
File.AppendAllText(fileName, str);
but the file always is empty. 但是文件始终为空。 What is wrong?
怎么了?
i think what you need is string.Format() 我认为您需要的是string.Format()
string str = string.Format("Insert into {0}(id, t, v) values({1}, {2}, {3});{4}",tname, lc,mc,rc, Environment.NewLine);
string.Join
is to concatenate a String[]
of objects using a separator string.Join
用于使用分隔符连接对象的String[]
eg 例如
List<int> l= new List { 1,2,3 };
var s = string.Join(",",l);
s is then "1,2,3"
s是
"1,2,3"
In your code you are basically passing in a very long separator (your string) and an empty array. 在代码中,您基本上传递了一个很长的分隔符(您的字符串)和一个空数组。
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