Example
class ReadFromFile
{
static void Main()
{
// The files used in this example are created in the topic
// How to: Write to a Text File. You can change the path and
// file name to substitute text files of your own.
// Example #1
// Read the file as one string.
string text = System.IO.File.ReadAllText(@"C:\Users\Public\TestFolder\WriteText.txt");
// Display the file contents to the console. Variable text is a string.
System.Console.WriteLine("Contents of WriteText.txt = {0}", text);
// Example #2
// Read each line of the file into a string array. Each element
// of the array is one line of the file.
string[] lines = System.IO.File.ReadAllLines(@"C:\Users\Public\TestFolder\WriteLines2.txt");
// Display the file contents by using a foreach loop.
System.Console.WriteLine("Contents of WriteLines2.txt = ");
foreach (string line in lines)
{
// Use a tab to indent each line of the file.
Console.WriteLine("\t" + line);
}
// Keep the console window open in debug mode.
Console.WriteLine("Press any key to exit.");
System.Console.ReadKey();
}
}
C# 如何读取文本文件中的内容