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多次调用 matlab 似乎是不可能的：

[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()

我还想知道是否可以运行类似“线程”的东西（即为每个 DTO 对象生成一个线程）。谢谢。

4

1 回答 1

2

解决方案。代替：

object result;

和：

object result = null;

这是 Mathworks 的回复：

此错误是由于 GetWorkspaceData 期望一个空的 VARIANT 作为输出参数，但在运行一次循环后，结果实际上变成了值为 0.0 的双精度值。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);
}
于 2012-09-05T14:42:17.100 回答