c#打开文件，路径以%userprofile%开头
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c# open file, path starting with %userprofile%
提问by Istrebitel
I have a simple problem. I have a path to a file in user directory that looks like this:
我有一个简单的问题。我在用户目录中有一个文件路径，如下所示：
%USERPROFILE%\AppData\Local\MyProg\settings.file
When I try to open it as a file
当我尝试将其作为文件打开时
ostream = new FileStream(fileName, FileMode.Open);
It spits error because it tries to add %userprofile%to the current directory, so it becomes:
它吐出错误，因为它试图添加%userprofile%到当前目录，所以它变成：
C:\Program Files\MyProg\%USERPROFILE%\AppData\Local\MyProg\settings.file
How do I make it recognise that a path starting with %USERPROFILE%is an absolute, not a relative path?
我如何让它认识到以 开头的路径%USERPROFILE%是绝对路径，而不是相对路径？
PS: I cannot use
PS：我不能用
Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData)
Because I need to just open the file by its name. User specifies the name. If user specifies "settings.file", I need to open a file relative to program dir, if user specifies a path starting with %USERPROFILE%or some other thing that converts to C:\something, I need to open it as well!
因为我只需要按文件名打开文件。用户指定名称。如果用户指定“settings.file”，我需要打开一个相对于程序目录的文件，如果用户指定的路径以%USERPROFILE%或其他一些转换为 C:\something 的东西开头，我也需要打开它！
采纳答案by Oded
Use Environment.ExpandEnvironmentVariableson the path before using it.
使用Environment.ExpandEnvironmentVariables前在路径上使用。
var pathWithEnv = @"%USERPROFILE%\AppData\Local\MyProg\settings.file";
var filePath = Environment.ExpandEnvironmentVariables(pathWithEnv);
using(ostream = new FileStream(filePath, FileMode.Open))
{
//...
}
回答by David M
Use the Environment.ExpandEnvironmentVariablesstatic method:
使用Environment.ExpandEnvironmentVariables静态方法：
string fileName= Environment.ExpandEnvironmentVariables(fileName);
ostream = new FileStream(fileName, FileMode.Open);
回答by Andras Zoltan
Try using ExpandEnvironmentVariableson the path.
尝试在路径上使用ExpandEnvironmentVariables。
回答by NeverJr
You can use the Environment.Usernameconstant as well. Both of the %USERPROFILE%and this Environment variable points the same( which is the currently logged user). But if you choose this way, you have to concatenate the path by yourself.
您也可以使用Environment.Username常量。两者的%USERPROFILE%和这个环境变量指向相同（这是当前登录用户）。但是如果你选择这种方式，你必须自己连接路径。
回答by john rains
I use this in my Utilities library.
我在我的实用程序库中使用它。
using System;
namespace Utilities
{
public static class MyProfile
{
public static string Path(string target)
{
string basePath =
Environment.GetFolderPath(Environment.SpecialFolder.UserProfile) +
@"\Automation\";
return basePath + target;
}
}
}
So I can simply use e.g. "string testBenchPath = MyProfile.Path("TestResults");"
所以我可以简单地使用例如“string testBenchPath = MyProfile.Path("TestResults");”
