Question

注意：这不是重复项。这与中的空引用无关一般而言，它特定于R.Net

我正在使用r.net 1.7版

为什么会出现此null ref错误？我来自：

https://github.com/rdotnet/rdotnet/blob/master/TestApps/SimpleTest/Program.cs

   public static void Go()
    {
        string rHome = null;
        string rPath = null;

    NativeUtility util = new NativeUtility();
    Console.WriteLine(util.FindRPaths(ref rPath, ref rHome));


    REngine.SetEnvironmentVariables(rPath: rPath, rHome: rHome);
    using (REngine engine = REngine.GetInstance())
    {

    }

REngine.GetInstance引发此错误：

System.NullReferenceException未处理 HResult = -2147467261 Message =对象引用未设置为对象的实例。来源= RDotNet 堆栈跟踪：在RDotNet.SymbolicExpression..ctor（REngine引擎，IntPtr指针）在RDotNet.ExpressionVector.GetValue（Int32索引）在RDotNet.ExpressionVector.get_Item（Int32索引）在RDotNet.Vector 1.<GetEnumerator>d__22.MoveNext() at System.Linq.Enumerable.First[TSource](IEnumerable 1个源中）在RDotNet.REngine.Parse（String语句，StringBuilder incompleteStatement）在RDotNet.REngine.d__46.MoveNext（）在System.Linq.Enumerable.LastOrDefault [TSource]（IEnumerable`1源）处在RDotNet.REngine.Evaluate（String语句）在RDotNet.REngine.Initialize（StartupParameter参数，ICharacterDevice设备，布尔值setupMainLoop）在RDotNet.REngine.GetInstance（字符串dll，布尔值初始化，StartupParameter参数，ICharacterDevice设备）在H：\ Projects \ GeneralTests \ GeneralTests \ RTest.cs：line 23的GeneralTests.RTest.Go（）中在H：\ Projects \ GeneralTests \ GeneralTests \ Form1.cs：line 57中的GeneralTests.Form1.button7_Click（Object sender，EventArgs e）中在System.Windows.Forms.Control.OnClick（EventArgs e）在System.Windows.Forms.Button.OnClick（EventArgs e）在System.Windows.Forms.Button.OnMouseUp（MouseEventArgs mevent）在System.Windows.Forms.Control.WmMouseUp上（消息和m，MouseButtons按钮，Int32单击）在System.Windows.Forms.Control.WndProc（Message＆m）在System.Windows.Forms.ButtonBase.WndProc（Message＆m）在System.Windows.Forms.Button.WndProc（Message＆m）在System.Windows.Forms.NativeWindow.DebuggableCallback（IntPtr hWnd，Int32 msg，IntPtr wparam，IntPtr lparam）在System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW（MSG＆msg）在System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop（IntPtr dwComponentID，Int32原因，Int32 pvLoopData）在System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner（Int32原因，ApplicationContext上下文）在System.Windows.Forms.Application.ThreadContext.RunMessageLoop（Int32原因，ApplicationContext上下文）在H：\ Projects \ GeneralTests \ GeneralTests \ Program.cs：line 19中的GeneralTests.Program.Main（）在System.AppDomain._nExecuteAssembly（RuntimeAssembly程序集，String []参数）在System.AppDomain.ExecuteAssembly（String assemblyFile，Evidence assemblySecurity，String [] args）中在Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly（）在System.Threading.ExecutionContext.RunInternal（ExecutionContext executeContext，ContextCallback回调，对象状态，布尔类型saveSyncCtx）在System.Threading.ExecutionContext.Run（ExecutionContext执行上下文，ContextCallback回调，对象状态，布尔类型saveSyncCtx）在System.Threading.ExecutionContext.Run（ExecutionContext执行上下文，ContextCallback回调，对象状态）在System.Threading.ThreadHelper.ThreadStart（） InnerException：

未设置什么对象引用？

0 个答案: