如何获得网格可见行的计数？

Question

我们在填充数据时遇到了这个障碍。让我们说我有11个测试，每个测试有两个目标。代码将数据填充到 WPF 中的 DevExpress 数据网格中。所以我有11个测试，但只有5个可见（我们滚动查看其余部分）：

我正在努力完成类似的事情：

    on first   VISIBLE row [Test1][Target1]
    on second  VISIBLE row [Test2][Target1]
    ..
    on last    VISIBLE row [Testn][Target1]

    next column

    on first   VISIBLE row [Test1][Target2]
    on second  VISIBLE row [Test2][Target2]
    ..
    on last    VISIBLE row [Testn][Target2]

当前代码是来自网格的事件处理程序，但它可以使用错误。它被称为与可见行数（!!）完全相同但是我无法找到如何控制它。代码导致问题（有时重复数据并有时在列之间翻转数据）。评论是我真正想要的。一旦到达最后一个可见行，我需要递增目标索引unboudSampleDrawIndex。请帮忙

private void testGrid_CustomUnboundColumnData(object sender, GridColumnDataEventArgs e)
{
    if (e.IsGetData)
    {
        Test currentTest = ((GalleryViewModel)DataContext).CurrentTests.ElementAtOrDefault(e.ListSourceRowIndex);
        unboundSampleDrawIndex = 0; // starts from target zero

        if (currentTest != null)
        {
            if ((int)e.Column.Tag < currentTest.Samples.Count && unboundSampleDrawIndex <= currentTest.Samples.Count - 1)
            {
                if (currentTest.IsReference)
                    e.Value = currentTest.Samples.ElementAt(unboundSampleDrawIndex).ABC; // here I am taking target 0 for the first column, until incremented
                else
                    e.Value = currentTest.Samples.ElementAt(unboundSampleDrawIndex).Delta; // here I am taking target 0 for the first column, until incremented
            }
            else
                e.Value = "";

            if (unboundSampleDrawIndex >= ??? ) //here I want to know it reached the last visible row
                unboundSampleDrawIndex++; // incremenet to populate next target
        }
    }
}

Answer 1

这解决了这个问题。通过为每列生成标记，然后将其设置为目标向量中的索引。

    private void testGrid_CustomUnboundColumnData(object sender, GridColumnDataEventArgs e)
    {

        if (e.IsGetData)
        {
            Test currentTest = ((GalleryViewModel)DataContext).CurrentTests.ElementAtOrDefault(e.ListSourceRowIndex);

            if (currentTest != null)
            {
                if ((int)e.Column.Tag < currentTest.Samples.Count && unboundSampleDrawIndex <= currentTest.Samples.Count - 1)
                {
                    if (currentTest.IsReference)
                    {
                        e.Value = currentTest.Samples.ElementAt((int)e.Column.Tag).ABC;
                    }

                    else
                    {
                        e.Value = currentTest.Samples.ElementAt((int)e.Column.Tag).Delta;
                    }

                    unboundSampleDrawIndex++;
                }

                else
                {
                    e.Value = "";
                }

                if (unboundSampleDrawIndex >= currentTest.Samples.Count)
                {
                    unboundSampleDrawIndex = 0;
                }
            }
        }
    }