csharp 使用StringBuilder对象连接，比使用+ =进行字符串连接要好得多

Posted 2021-05-12

// This example concatenates using StringBuilder object then writes contents of the 
// StringBuilder object out to a file using streamwriter
 
StringBuilder textSB = new StringBuilder();
string newLine;
 
for(int i = 0; i < 50; i++)
{
	newLine = "Line # " + i;
	textSB.Append(newLine).Append("|").Append("\r\n");
}
 
string filePath = @"c:\output.txt";
using (StreamWriter outFile = new StreamWriter(filePath))
    outFile.Write(textSB.ToString());