How to Execute CLI Applications From C# and 返回执行中的输出信息，这里提供几种方法~

这位兄弟贴了段代码，目的是用Process类执行控制台命令并获执行该命令的输出信息，但执行失败了，代码这样的

var psiNpm = new ProcessStartInfo
{
    FileName = "cmd.exe",
    RedirectStandardOutput = true,
    RedirectStandardInput = true,
    UseShellExecute = false
};
var pNpmRun = Process.Start(psiNpm);
pNpmRun.StandardInput.WriteLine("/c echo \"Fuck World\"");
pNpmRun.StandardInput.WriteLine("echo \"Fuck World\"");
var output = pNpmRun.StandardOutput.ReadToEnd();
pNpmRun.StandardInput.WriteLine("exit");
pNpmRun.WaitForExit();
Console.WriteLine(output);

然后ChatGPT帮他解决了

Process process = new Process();
//process.StartInfo.FileName = "cmd.exe";
process.StartInfo.FileName = "cmd";
//process.StartInfo.Arguments = "/c echo \"Fuck World\"";
process.StartInfo.Arguments = "/c echo Fuck World";
//process.StartInfo.Arguments = "/c dotnet --list-sdks";
process.StartInfo.UseShellExecute = false;
process.StartInfo.RedirectStandardOutput = true;
process.Start();
process.WaitForExit();
string output = process.StandardOutput.ReadToEnd();
Console.WriteLine(output);

热心网友贴了段代码说是自己执行失败了，但贴主和我都能执行成功。

我对图中代码做了点修改，如下：

var startInfo = new ProcessStartInfo()
{
    FileName = "cmd",
    Arguments = "/c echo Hello World",
    UseShellExecute = false,
    RedirectStandardOutput = true
};

startInfo.Arguments = "/c dotnet --list-sdks";

//if (!string.IsNullOrEmpty(dir))
//    startInfo.WorkingDirectory = dir;

var p = new Process
{
    StartInfo = startInfo,
    EnableRaisingEvents = true
};
var outputBuilder = new StringBuilder();
p.OutputDataReceived += (sender, args) => outputBuilder.Append(args.Data+"\r\n");
p.Start();
p.BeginOutputReadLine();
p.WaitForExit();
p.CancelOutputRead();
Console.WriteLine(outputBuilder.ToString());

其实贴主第一次放出来的代码调整下顺序也是能执行成功的，像这样：

var psiNpm = new ProcessStartInfo
{
    FileName = "cmd",
    RedirectStandardOutput = true,
    RedirectStandardInput = true,
    UseShellExecute = false
};
var pNpmRun = Process.Start(psiNpm);
pNpmRun.StandardInput.WriteLine("echo \"Hello World\"");
pNpmRun.StandardInput.WriteLine("exit");
pNpmRun.WaitForExit();
var output = pNpmRun.StandardOutput.ReadToEnd();
Console.WriteLine(output);

等待执行结束pNpmRun.WaitForExit();

再去读取输出信息var output = pNpmRun.StandardOutput.ReadToEnd();

最后贴主给出了final solution

我复制粘贴执行了下，没问题~

        static void Main(string[] args)
        {
            Console.WriteLine("Hello, World!");
            Execute().Wait();
        }

        static async Task Execute()
        {
            var psi = new ProcessStartInfo()
            {
                FileName = "dotnet",
                Arguments = "--list-sdks"
            };
            
            using var proc=Process.Start(psi)!;
            await proc.WaitForExitAsync();
            
        }

以上是C#四种不同的方式使用Porcess执行命令后获取该命令的输出信息。

代码复制粘贴就能执行~