C# File API

【C# File API】

一、System.IO.File

　　Provides static methods for the creation, copying, deletion, moving, and opening of a single file, and aids in the creation of FileStream objects. 

　　

　　1）File.CreateText

　　　　Creates or opens a file for writing UTF-8 encoded text. If the file already exists, its contents are overwritten.

　　　　

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