输出所有命令行参数

Question

I am working on a console application, that receives a pretty long list of parameters. For debugging purpose I need to print the parameters passed to a an output file. Right now, I am using the following code to concat command line parameters.

static void Main(string[] args)
{
    string Params = string.Empty;
    foreach(string arg in args)
    {
       Params += arg + ",";
    }
}

Is there any better way to accomplish this?

Answer 1

What about

Params = string.Join(",", args);

Your foreach approach is not very performant. Since a string is immutable , that means for each iteration of the loop, the string will get thrown away for garbage collection, and a new string will be generated. In the string.Join case, only one string will be generated.

Inside the loop, to get around the same performance, you will have to use a StringBuilder , but in this case it's really no reason not to use string.Join since the code will be much more readable.

Answer 2

你可以使用String.Join（“，”，args）

Answer 3

你可以使用这段代码

String.Join(", ", Environment.GetCommandLineArgs())

Answer 4

All of the answers here combining the arguments with a single comma will work, but I found that approach lacking somewhat because there's not a clear indicator of "quoted arguments" and those that might contain a comma.

Using the example: Foo.exe an example "is \\"fine\\", too" okay

The simple join suggestions will yield: an, example, is "fine", too, okay . Not bad, but not very clear and somewhat misleading.

Here's what I threw together that works well enough for me. I'm sure it could be improved further.

String.Join(", ", (from a in args select '"' + a.Replace("\"", @"\""") + '"'));

It returns the string: "an", "example", "is \\"fine\\", too", "okay" . I think this does a better job indicating the actual parameters.

Answer 5

String params = String.Join(",", args);

Answer 6

You should use:

string.Join(",", args);

Strictly speaking the Join function creates a StringBuilder with capacity strings.Length * 16 (this 16 is a fixed number). If you have different args maximum size and if performance is crucial to you, use a StringBuilder with a specific capacity.