Question

有人可以告诉我如何做到这一点吗？

我试过了

dtgMain.RowHeight;

但这总是返回NAN。

Answer 1

从数据网格中使用VisualTreeHelper获取DataGridRow。然后在DataGridRow上使用ActualHeight属性。

public static T GetFirstVisualChild<T>(DependencyObject depObj) where T : DependencyObject
{
    if (depObj != null)
    {
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
        {
            DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
            if (child != null && child is T)
            {
                return (T)child;
            }

            T childItem = GetFirstVisualChild<T>(child);
            if (childItem != null) return childItem;
        }
    }

    return null;
}

然后：

DataGridRow row = GetFirstVisualChild<DataGridRow>(dtgMain);
if(row != null)
{
    row.ActualHeight;
}

Answer 2

这很可能是因为网格尚未渲染。检查措施＆amp;在尝试获取RowHeigth之前，将函数排列为渲染网格。

Answer 3

这是NaN，因为你没有定义它。如果不手动设置，则由行内容的度量结果定义。

Answer 4

如果有人现在需要VB.NET版本......

Public Shared Function GetFirstVisualChild(Of T As DependencyObject)(depObj As DependencyObject) As T
    If (depObj IsNot Nothing) Then
        Dim i As Integer
        For i = 0 To VisualTreeHelper.GetChildrenCount(depObj) - 1

            Dim child As DependencyObject = VisualTreeHelper.GetChild(depObj, i)
            If (child IsNot Nothing AndAlso TypeOf child Is T) Then

                Return CType(child, T)
            End If

            Dim childItem As T = GetFirstVisualChild(Of T)(child)
            If (childItem IsNot Nothing) Then Return childItem
        Next
    End If
    Return Nothing
End Function

然后

Dim row As DataGridRow = CType(GetFirstVisualChild(Of DataGridRow)(grid), DataGridRow)

在WPF数据网格中查找行的高度

4 个答案: