Question

似乎无法多次调用matlab：

[STAThread]
static void Main(string[] args)
{
    IList<DTO> LotsOfWork = new List<DTO>();
    // create some work
    for(int c = 0; c < 10; c++)
    {
    LotsOfWork.Add(new DTO(){ Id = c, Parameter1 = c, Parameter2 = c });
    }

    // deal with work
    foreach (DTO DTO in LotsOfWork)
    {
    MLApp.MLApp matlab = new MLApp.MLApp();
    object result;

    matlab.Execute("clear;");
    matlab.PutWorkspaceData("a", "base", DTO.Parameter1);
    matlab.PutWorkspaceData("b", "base", DTO.Parameter2);
    matlab.Execute("result = a + b;");
    matlab.GetWorkspaceData("result", "base", out result);
    }
}

public class DTO
{
    public int Id { get; set; }
    public double Parameter1 { get; set; }
    public double Parameter2 { get; set; }
    public string Result { get; set; }
}

第二次循环迭代抛出异常：

at System.RuntimeType.ForwardCallToInvokeMember(String memberName, BindingFlags flags, Object target, Int32[] aWrapperTypes, MessageData& msgData)
at MLApp.DIMLApp.GetWorkspaceData(String Name, String Workspace, Object& pdata)
at Sandbox.Program.Main(String[] args) in C:\Bla\Program.cs:line 53
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

我也想知道是否可以运行类似'threaded'的东西（即为每个DTO对象生成一个线程）。感谢。

Answer 1

解。替换：

object result;

使用：

object result = null;

这是Mathworks的回复：

这个错误是由于GetWorkspaceData期望一个空的VARIANT作为输出参数但在运行一次循环之后，结果实际上变为值为0.0的double。因此，您需要将循环更改为：

foreach (DTO DTO in LotsOfWork)
{

    object result = null; //Initialize as null

    matlab.Execute("clear;");
    matlab.PutWorkspaceData("a", "base", DTO.Parameter1);
    matlab.PutWorkspaceData("b", "base", DTO.Parameter2);
    matlab.Execute("result = a + b;");
    matlab.GetWorkspaceData("result", "base", out result);
}

从.net多次调用matlab

1 个答案: