通过C#运行weka

Question

我通过C#代码运行weka，代码如下所示。

 using System;

 class MainClass
 {
      public static void Main(string[] args)
 {
     Console.WriteLine("Hello Java, from C#!");
     classifyTest();
  }

  const int percentSplit = 66;
  public static void classifyTest()
  {
     try
     {
         weka.core.Instances insts = new weka.core.Instances(new java.io.FileReader("iris.arff"));
         insts.setClassIndex(insts.numAttributes() - 1);

         weka.classifiers.Classifier cl = new weka.classifiers.trees.J48();
         Console.WriteLine("Performing " + percentSplit + "% split evaluation.");

         //randomize the order of the instances in the dataset.
                     weka.filters.Filter myRandom = new weka.filters.unsupervised.instance.Randomize();
         myRandom.setInputFormat(insts);
                     insts = weka.filters.Filter.useFilter(insts, myRandom);

         int trainSize = insts.numInstances() * percentSplit / 100;
         int testSize = insts.numInstances() - trainSize;
         weka.core.Instances train = new weka.core.Instances(insts, 0, trainSize);

         cl.buildClassifier(train);
         int numCorrect = 0;
         for (int i = trainSize; i < insts.numInstances(); i++)
         {
             weka.core.Instance currentInst = insts.instance(i);
             double predictedClass = cl.classifyInstance(currentInst);
             if (predictedClass = insts.instance(i).classValue())
                 numCorrect++;
         }
         Console.WriteLine(numCorrect + " out of " + testSize + " correct (" +
                    (double)((double)numCorrect / (double)testSize * 100.0) + "%)");
     }
     catch (java.lang.Exception ex)
     {
         ex.printStackTrace();
     }
 }

 }
 //end of file Main.cs

我已经添加了Weka.dll和ikvm.JDK.Core.dll文件。但是当我尝试运行它时，我得到了这个错误

“java.io.file”的类型初始值设定项引发了异常

可能的问题是什么？

Answer 1

问题是您没有添加所需的所有引用，您必须添加所有以ikvm.OpenJDK开头的dll文件，并且文件IKVM.Runtime.dll还确保您使用IKVM将weka.jar转换为weka.dll

Answer 2

确保为IKVM.Runtime.dll和IKVM.Runtime.JNI.dll添加引用

Answer 3

您没有指定"iris.arff"的路径，该文件可能不在应用程序的启动目录中。