我们如何在.net framework 3.5中使用AppendAllLines [英] How can we use AppendAllLines in .net framework 3.5

问题描述

AppendAllLines适用于.net framework 4.5

但我们如何使用追加3.5中的所有行

  //   4.5  
  string  [] a = < span class =code-keyword> new   string  [] {fa +  < span class =code-string> + lastModified}; 
 System.IO.File.AppendAllLines（filepath，a）; 
 
  //   3.5  
  string  [] a =  new   string  [] {fa +   + lastModified}; 
  var  ab =  string  .Join（Environment.NewLine，DataList.Select（x = < span class =code-keyword>>  x.blah blah blah）。ToArray（））; 
  string  outputFilePath =  @  C：\\ \\output.txt; 
 File.AppendAllText（outputFilePath，ab）; 
 
  public   static   void  AppendAllLines（ string  path，IEnumerable< string> lines）
 {
  using （ var  writer =  new  StreamWriter（path， true ））
  foreach （ var  line  in 行）
 writer.WriteLine（line）; 
} 

解决方案

您不能在.NET 4.0之前的版本中使用File.AppendAllLines - 它已添加到点。



相反，您需要执行类似于您在问题中显示的string.Join代码。

< pre lang =cs> string [] a = new string [] {fa + + lastModified};
使用（TextWriter writer = File.AppendText（filepath））
{
foreach （ string actor in a）
{
writer.WriteLine （演员）;
}
} Console.WriteLine（fa）;

AppendAllLines is work in .net framework 4.5
but how can we use append all line in 3.5

//4.5
string[] a = new string[] { fa + " "+ lastModified };
System.IO.File.AppendAllLines(filepath, a);

//3.5
string[] a = new string[] { fa + " "+ lastModified };
var ab = string.Join(Environment.NewLine, DataList.Select(x => x.blah blah blah).ToArray());
string outputFilePath = @"C:\output.txt";
File.AppendAllText(outputFilePath, ab);

public static void AppendAllLines(string path, IEnumerable<string> lines)
{
     using (var writer = new StreamWriter(path, true))
         foreach (var line in lines)
             writer.WriteLine(line);
}

解决方案

You can't use File.AppendAllLines in version prior to .NET 4.0 - it was added at that point.

Instead, you would need to do something like the string.Join code you show in your question.

string[] a = new string[] { fa + " "+ lastModified };
                          using (TextWriter writer = File.AppendText(filepath))
                          {
                              foreach (string actor in a)
                              {
                                  writer.WriteLine(actor);
                              }
                          } Console.WriteLine(fa);

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