Question

我有一个使用Excel-DNA创建的Excel Addin，并且有一个UDF作为Excel加载项的一部分。假设该函数在单元格A10中，我将删除列Z.我发现此操作会导致函数再次执行。

有没有办法防止这种行为发生？这与计算模型或波动率有关吗？

编辑1

我正在使用以下代码来实现类似Bloomberg BDH功能的行为 - 即该函数是在第一个单元格中编写的，而其余的数组是通过线程编写的。

我有两个问题：

我无法确定如何在写入函数的单元格中显示消息。例如，如果函数在单元格A1中运行，则会显示消息“正在处理...”，直到写入单元格的值。
此实现会重新计算函数。

我已经看到了第1项和第1项的实施。以上2项运作良好，但无法确定如何做到这一点。有没有人有任何想法

public class ArrayWriter
{
    #region Methods

    #region WriteArray
    [ExcelFunction(IsHidden=true)]
    public object WriteArray(object[,] arrayToWrite)
    {
        object caller = null;
        object formula = null;
        AddInFacade facade;

        // if not in a function
        if (!ExcelDnaUtil.IsInFunctionWizard())
        {
            facade = new AddInFacade();

            if (arrayToWrite != null)
            {
                // if writing more than one cell, use threads
                if (arrayToWrite.GetLength(0) > 1 || arrayToWrite.GetLength(1) > 1)
                {
                    var xlApp = ExcelDnaUtil.Application as Application;
                    Type xlAppType = xlApp.GetType();

                    caller = xlApp.Caller;
                    //caller = xlAppType.InvokeMember("ActiveCell", BindingFlags.GetProperty, null, xlApp, null);
                    formula = xlAppType.InvokeMember("FormulaR1C1Local", BindingFlags.GetProperty, null, caller, null);

                    // create instance of ObjectForThread and set all properties of the class
                    ObjectForThread threadObject = new ObjectForThread()
                    {
                        xlRef = caller,
                        value = arrayToWrite,
                    };

                    // create a new thread calling the method WriteFromThread and start the thread
                    Thread threadWriter = new Thread(() => WriteFromThread(threadObject));
                    threadWriter.Start();
                }
                else
                {
                    facade.SetMouseCursor(XlMousePointer.xlDefault);
                }
            }
            else
            {
                arrayToWrite = new object[1, 1];
                arrayToWrite[0, 0] = "No data was returned.";
                facade.SetMouseCursor(XlMousePointer.xlDefault);
            }
        }

        return arrayToWrite[0,0];
    }
    #endregion

    #region WriteFromThread
    private void WriteFromThread(Object boxedThreadObject)
    {
        AddInFacade facade = new AddInFacade();

        ObjectForThread unboxedThreadObject = (ObjectForThread)boxedThreadObject;
        Object cellBelow;

        Type typeCellReference = unboxedThreadObject.xlRef.GetType();

        try
        {
            for (int i = 0; i < unboxedThreadObject.value.GetLength(0); i++)
            {
                for (int j = 0; j < unboxedThreadObject.value.GetLength(1); j++)
                {
                    // do not write the first cell as this is what is returned by the function
                    if (i > 0 || j > 0)
                    {
                        cellBelow = typeCellReference.InvokeMember("Offset", BindingFlags.GetProperty, null, unboxedThreadObject.xlRef, new object[] { i, j });
                        typeCellReference.InvokeMember("Value", BindingFlags.SetProperty, null, cellBelow, new[] { Type.Missing, unboxedThreadObject.value[i, j] });
                    }
                }
            }
        }
        catch(Exception ex)
        {
            string szError = ex.Message;
        }
        finally
        {
            // attempt to kill all COM references
            unboxedThreadObject.xlRef = null;
            unboxedThreadObject.value = null;

            //Set the mouse cursor to the default cursor since the entire array has now been written
            facade.SetMouseCursor(XlMousePointer.xlDefault);

            unboxedThreadObject = null;
            cellBelow = null;
            facade = null;
        }
    }
    #endregion

    #endregion

    #region ObjectForThread Class
    public class ObjectForThread
    {
        public object xlRef { get; set; }
        public object[,] value { get; set; }
    }
    #endregion
}

Answer 1

更改此行为的唯一方法是更改Application.Calculation属性。但你不想这样做。此属性应该只是暂时更改，然后应该重置为以前的值。否则，您正在编写一个在共享沙箱中无法正常播放的插件。

如何在Excel用户定义函数中编写数组

1 个答案: