逐行读

            jsonString = string.Empty;if (File.Exists(jsonFile)){StreamReader sr = new StreamReader(jsonFile, Encoding.UTF8);string line =string.Empty;while ((line = sr.ReadLine()) != null){jsonString += line;}sr.Close();}

全读取

string text = File.ReadAllText(@"C:\Users\Public\TestFolder\WriteText.txt");string[] lines = File.ReadAllLines(@"C:\Users\Public\TestFolder\WriteLines2.txt");

输出txt log

        public static bool outputLog(string logStr){bool result = false;if (logStr != null){string path = @"c:\MyToolLog.txt";// This text is added only once to the file.if (!File.Exists(path)){// Create a file to write to.string createText = "Hello and Welcome" + Environment.NewLine;File.WriteAllText(path, createText, Encoding.UTF8);}// This text is always added, making the file longer over time// if it is not deleted.string appendText = DateTime.Now.ToString("MMddHHmmss")+"   "+ logStr + Environment.NewLine;File.AppendAllText(path, appendText, Encoding.UTF8);result=true;}return result;}