SaveFileDialog我应该使用FilterIndex属性还是FileName属性的扩展名? [英] SaveFileDialog should I use the FilterIndex property or the extension of the FileName property?

问题描述

前几天，我遇到以下问题 SaveFileDialog AddExtension无法按预期工作.现在我想到了一个后续问题.

The other day I had the following question SaveFileDialog AddExtension doesn't work as expected. Now a follow up question came to my mind.

我应该使用 FilterIndex 属性或 FileName <的扩展名 SaveFileDialog 的/a>属性确定我要以哪种文件格式存储数据?

Should I use the FilterIndex property or the extension of the FileName property of the SaveFileDialog to decide under which file format I want to store the data?

我有以下C#测试代码:

I've the following C# test code:

var dialog = new SaveFileDialog();
dialog.AddExtension = true;
dialog.DefaultExt = "txt";
dialog.Filter = "Text files (*.txt)|*.txt|XML files (*.xml)|*.xml";
dialog.OverwritePrompt = true;
if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
    string extension = System.IO.Path.GetExtension(dialog.FileName);
    int filterIndex = dialog.FilterIndex;
}

文档引用以下内容:

显示文件后，您也可以使用FilterIndex的值根据过滤器执行特殊文件操作的对话框选择.

You can also use the value of FilterIndex after showing the file dialog to perform special file operations depending upon the filter chosen.

如果我使用 FilterIndex 属性，它将保存例如带有XML扩展名的文本文档(对话框 File name = test7.xml ，对话框 Save as类型= * .txt ).

If I use the FilterIndex property it will save for example a text document with an XML extension (Dialog File name = test7.xml, Dialog Save as type = *.txt).

如果我使用 FileName 的扩展名，则对话框的另存为类型将被忽略.

If I use the extension of the FileName then the Save as type of the dialog is ignored.

推荐答案

文件名和格式之间存在差异.

There's a difference between the file's name and its format.

FilterIndex属性可以指定文件的格式，但是FileName应该指定他们希望文件如何命名.这些可以不同.

The FilterIndex property can specify the format of the file, but the FileName should specify how they want the file named. These can be different.

但是要当心.如果格式列表中包含"所有文件(*.*)"的选项，则会遇到默认格式的问题.这种格式对用户来说很明显吗?

Beware, however. If your list of formats includes an option for "All Files (*.*)", you run into an issue with the default format. Is that format obvious to the user?

简而言之，我对您的建议是使用下拉列表作为格式，并使用FileName.让用户保存扩展名为.TXT的CSV文件.

My suggestion to you, in short, is to use the drop-down list for the format, and the FileName for just that. Let a user save a CSV file with a .TXT extension.

这篇关于SaveFileDialog我应该使用FilterIndex属性还是FileName属性的扩展名?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！