Question

我想在vb.net中运行一个r脚本，它将数据保存在.csv文件中。直到现在我发现了以下方法：

dim strCmd as String
strCmd = "R CMD BATCH" + "C:\test.R"
process.start("CMD.exe", strCmd

显然这应该可以工作，但在我的情况下，cmd弹出（在我的调试文件夹中lokated）并且没有任何反应。

我尝试的另一种方式是

process.start("Rgui.exe", "C:\test.R")

错误消息：参数“C：\ test.R”忽略

这也不起作用。

我的r脚本我只是用了一个例子

sink()
setwd("C:/")
x <- data.frame(a = I("a \" quote"), b = pi)
sink(test.csv)

Answer 1

这对我有用：

        Dim myprocess As New Process
        myprocess.StartInfo = New ProcessStartInfo("C:\Program Files (x86)\R\R-2.6.2\bin\R.exe", "CMD BATCH C:/Users/test/test3.R C:/Users/test/testout.csv")
        myprocess.Start()

第二种方法（第一个app。并没有给我一个好的csv输出，所以这里是一个解决方法）：

    Dim proc = New Process
    proc.StartInfo.FileName = "C:\Program Files (x86)\R\R-2.6.2\bin\Rscript.exe"
    proc.StartInfo.WorkingDirectory = "C:\Program Files (x86)\R\R-2.6.2\bin"
    proc.StartInfo.Arguments = "C:/Users/Desktop/RtoVB/test4.r"
    proc.StartInfo.UseShellExecute = True
    proc.StartInfo.RedirectStandardOutput = False
    proc.Start()

Answer 2

这是我最近为此目的写的课程。您还可以传入和返回来自C＃和R的参数：

/// <summary>
/// This class runs R code from a file using the console.
/// </summary>
public class RScriptRunner
{
    /// <summary>
    /// Runs an R script from a file using Rscript.exe.
    /// Example:  
    ///   RScriptRunner.RunFromCmd(curDirectory + @"\ImageClustering.r", "rscript.exe", curDirectory.Replace('\\','/'));
    /// Getting args passed from C# using R:
    ///   args = commandArgs(trailingOnly = TRUE)
    ///   print(args[1]);
    /// </summary>
    /// <param name="rCodeFilePath">File where your R code is located.</param>
    /// <param name="rScriptExecutablePath">Usually only requires "rscript.exe"</param>
    /// <param name="args">Multiple R args can be seperated by spaces.</param>
    /// <returns>Returns a string with the R responses.</returns>
    public static string RunFromCmd(string rCodeFilePath, string rScriptExecutablePath, string args)
    {
            string file = rCodeFilePath;
            string result = string.Empty;

            try
            {

                var info = new ProcessStartInfo();
                info.FileName = rScriptExecutablePath;
                info.WorkingDirectory = Path.GetDirectoryName(rScriptExecutablePath);
                info.Arguments = rCodeFilePath + " " + args;

                info.RedirectStandardInput = false;
                info.RedirectStandardOutput = true;
                info.UseShellExecute = false;
                info.CreateNoWindow = true;

                using (var proc = new Process())
                {
                    proc.StartInfo = info;
                    proc.Start();
                    result = proc.StandardOutput.ReadToEnd();
                    proc.Close();
                }

                return result;
            }
            catch (Exception ex)
            {
                throw new Exception("R Script failed: " + result, ex);
            }
    }
}

使用.net中的start.process运行R脚本

2 个答案: