如何复制文件并覆盖现有文件。 [英] How to copy the file and overwrite the existing one.

问题描述

我有两个名为load和new的按钮。首先，您必须读取/加载文件。当您单击新按钮时，它必须复制您从加载按钮加载/读取的文件并覆盖它并显示修改日期。我怎么能这样做。我试过下面的代码，没有任何反应。



新按钮下的副本代码



FileInfo originalfile = new FileInfo（PathSelection）; //这是w

FileInfo newfile = new FileInfo（PathSelection）; //我想

保存按钮

I have two buttons called load and new. first you have to read/load the file. when you click new button it must copy the file you loaded/read from load button and overwrite it and shows date modified as well. how can i do that.i tried the code below and nothing happens.

code for copy under new button

FileInfo originalfile = new FileInfo(PathSelection); //this is w
FileInfo newfile = new FileInfo(PathSelection); //i want to
save button

private void btnSave_Click(object sender, EventArgs e)
       {
               saveFileDialog1.InitialDirectory = PathSelection;
               saveFileDialog1.Title = "Save Resource Files";
               saveFileDialog1.CheckPathExists = true;
               saveFileDialog1.DefaultExt = "resx";
               saveFileDialog1.Filter = "Save Resource Files (*.resx)|*.resx";
               saveFileDialog1.RestoreDirectory = true;
               PathSelection = saveFileDialog1.FileName;}

推荐答案

你的第一个问题是你没有显示对话框...你应该有类似

Your first issue is that you have not shown the dialog ... you should have something like

if (saveFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
      PathSelection = saveFileDialog1.FileName;
      //Write to your file here - Filename will contain the fully pathed target
}

第二个问题是saveDialog实际上并没有为你保存文件 - 你必须这样做。



这可以像使用 File.WriteAllText 一样简单 - 它取决于你如何在另一个按钮下加载文件以及如何存储它在记忆中

The second problem is that the saveDialog doesn't actually save the file for you - you have to do that.

This could be as simple as using File.WriteAllText - it depends on how you've loaded the file under the other button and how you are storing it in memory

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