Question

我有两个数据网格。 DG1和DG2具有一列A（每列）和许多行。当用户在另一个数据网格中选择具有相同值的行时，任务是突出显示一个数据网格中的特定行。示例：用户选择DG1第5行第A列，其值为'ABC'。 “ ABC”是DG2中的第23行A列。因此，DG的第23行应以“红色”突出显示。反之亦然（单击DG2的第23行应突出显示DG1的第5行）。目前，我的代码通过调用Datagrid的SelectedItem属性来工作。不利的一面是选择存在无限循环，即当用户选择DG1的第5行时，它选择DG2的第23行，然后对DG1的第5行进行选择，然后对DG2的第23行进行选择。因此，解决我的问题的方法既可以解决此无限循环问题，也可以提供一种方法来突出显示具有特定颜色的数据网格的特定行，从而完全消除对数据网格的selecteditem属性的调用。

下面是一些代码：

//This is the function invoked when a user selects a row in a DG1
    private void DG1SelectedItem(object sender, SelectionChangedEventArgs e)
    {

        if (DG1.SelectedItem != null)
        {
            var val = DG1.SelectedItem; //Get the paticular row that was selected
            DataRowView row = (DataRowView)val;
            object[] list = row.Row.ItemArray;
            String rowValue = list[0].ToString(); //get the value within that selected row
            HighLightRow(DG2, account); //Call a function that highlights a particular row in a Datagrid with a given string value
        }

    }

    //This is the function invoked when a user selects a row in a DG2
    private void DG2SelectedItem(object sender, SelectionChangedEventArgs e)
    {

        if (DG2.SelectedItem != null)
        {
            var val = DG2.SelectedItem; //Get the paticular row that was selected
            DataRowView row = (DataRowView)val;
            object[] list = row.Row.ItemArray;
            String rowValue = list[0].ToString(); //get the value within that selected row
            HighLightRow(DG1, account); //Call a function that highlights a particular row in a Datagrid with a given string value
        }

    }

    //Function to highlight the row in datagrid 'dg' with value of 'value' (only checks first column)
    private void HighLightRow(DataGrid dg, string value)
    {
        dg.UnselectAll();
        var itemsource = dg.ItemsSource as IEnumerable;
        int index = 0;
        ArrayList rowIndices = new ArrayList();
        //loop through entire datagrid looking for the string 'value' in the first column
        //if found, store the index in an array so it can be utillized to highlight all rows later on
        foreach (var item in itemsource)
        {
            DataRowView row = item as DataRowView;
            object[] list = row.Row.ItemArray;
            String valueToFind = list[0].ToString();
            if (valueToFind.Equals(value))
                rowIndices.Add(index);
            index++;
        }

        //For all rows where the string 'value' was foung in the first column of the datagrid, highlight it
        //Currently the implementation relies on SelectedItem
        for (int i = 0; i < rowIndices.Count; i++)
        {
            object item = dg.Items[(int)rowIndices[i]];
            dg.SelectedItem = item; //this code then invokes DG2SelectedItem (or DG1SelectedItem depending on which SelectedItem function was initially invoked) and we have the inifite loop problem
            **/*
            This is where I would like to select the row at the indices stored in rowIndices and highlight them red (and not rely on dg.SelectedItem like in the line above)
            Something like:
                dg.Row[i].Background = Brushes.Red;
            */**
            int m = dg.SelectedIndex;
            dg.UpdateLayout();
            dg.ScrollIntoView(dg.Items[m]);
        }
        dg.LoadingRow += Dg_LoadingRow;

    }

Answer 1

在WPF中，建议不要在“窗口”或“控件”后面的代码中编写代码。使用MVVM方法要优越得多。您应该考虑转向该范例。

话虽如此，解决您的问题很简单。只需引入一个名为UpdateFlag的全局变量即可。在每个网格处理程序的开始处将其设置为true，在处理程序末尾将其设置为false。在每个处理程序的最开始（设置标志之前），检查此标志是否为true，如果是这种情况，则立即退出处理程序。这将停止选择更改的无限递归。

类似这样的东西：

private bool UpdateFlag = false;
private void FirstHandler()
{
  if(UpdateFlag) return;

  UpdateFlag = true;

  //Do your highlighting here

  UpdateFlag = false;
}

private void SecondHandler()
{
  if(UpdateFlag) return;

  UpdateFlag = true;

  //Do your highlighting here

  UpdateFlag = false;
}

WPF DataGrid单独的行颜色

1 个答案: