[英]Get UI Element (Inside Expander) by name in WPF
由於某些原因,我需要使用動態方法生成我的 UI。 下面是我的代碼片段。
string xaml = "";
UIElement elementM = null;
xaml = xaml + "<StackPanel Orientation='Vertical'>";
//Init & FreeSyn
xaml = xaml + String.Format("<Expander Margin='{0} {1} 0 0' VerticalAlignment='Top'>", iLeftMostPadding, iTopPadding);
xaml = xaml + "<Expander.Style>";
xaml = xaml + "<Style TargetType='Expander'>";
xaml = xaml + "<Setter Property='IsExpanded' Value='True' />";
xaml = xaml + "<Setter Property='Header' Value='Axes'/>";
xaml = xaml + "</Style>";
xaml = xaml + "</Expander.Style>";
xaml = xaml + "<Border BorderBrush='DodgerBlue' BorderThickness='1' Margin='3 3 3 0'>";
xaml = xaml + "<StackPanel Orientation='Vertical'>";
xaml = xaml + "<StackPanel Orientation='Horizontal'>";
xaml = xaml + String.Format("<Button Margin='{0} {1} 0 5' Name='btnCheckAll' Background='{2}' Foreground='{3}' Height='25' VerticalAlignment='Bottom' HorizontalAlignment='Right' Width='{4}'>Check All</Button>", iLeftPadding, iTopPadding, szBtnBG, szBtnFG, 82);
xaml = xaml + String.Format("<Button Margin='{0} {1} 0 5' Name='btnUncheckAll' Background='{2}' Foreground='{3}' Height='25' VerticalAlignment='Bottom' HorizontalAlignment='Right' Width='{4}'>Uncheck All</Button>", iLeftPadding, iTopPadding, szBtnBG, szBtnFG, 82);
xaml = xaml + "</StackPanel>";
int nRow = nAxisCount / 4;
if (nAxisCount % 4 != 0) { nRow++; }
xaml = xaml + String.Format(" <UniformGrid Columns='4' Rows='{0}'>", nRow);
for (int i = 0; i < nAxisCount; i++)
{
xaml = xaml + String.Format("<CheckBox Height='20' Name='chkIsAxis{0}' Margin='{1} {2} 0 0' Width='40' IsChecked = 'true'>{0}</CheckBox>", i, 0, iTopPadding);
}
xaml = xaml + "</UniformGrid>";
xaml = xaml + "</StackPanel>";
xaml = xaml + "</Border>";
xaml = xaml + "</Expander>";
.
.
.
elementM = (UIElement)XamlReader.Parse(xaml, context);
gridM.Children.Add(elementM);
string szTempM = "";
szTempM = "btnCheckAll";
Button btnCheckAll = CHelper.FindChild<Button>(elementM, szTempM); //Return Null Here !!!
btnCheckAll.Click += btnCheckAll_Click;
我無法按名稱獲得“全部檢查”和“取消全部檢查”按鈕。 如果在擴展器外分配兩個按鈕,我只會成功。 您知道如何按名稱獲取按鈕嗎? (內部擴展器)
我需要在其中添加一個 onClick 事件。
先感謝您。
用戶界面如下所示:
以下是我的 FindChild 代碼:
public static T FindChild<T>(DependencyObject parent, string childName)
where T : DependencyObject
{
// Confirm parent and childName are valid.
if (parent == null) return null;
T foundChild = null;
int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
for (int i = 0; i < childrenCount; i++)
{
var child = VisualTreeHelper.GetChild(parent, i);
// If the child is not of the request child type child
T childType = child as T;
if (childType == null)
{
// recursively drill down the tree
foundChild = FindChild<T>(child, childName);
// If the child is found, break so we do not overwrite the found child.
if (foundChild != null) break;
}
else if (!string.IsNullOrEmpty(childName))
{
var frameworkElement = child as FrameworkElement;
// If the child's name is set for search
if (frameworkElement != null && frameworkElement.Name == childName)
{
// if the child's name is of the request name
foundChild = (T)child;
break;
}
}
else
{
// child element found.
foundChild = (T)child;
break;
}
}
return foundChild;
}
等到您在 XAML 標記中定義的 Button 元素實際創建之后,再嘗試獲取對它們的引用。 您可以處理 Loaded 事件:
...
elementM = (UIElement)XamlReader.Parse(xaml);
gridM.Children.Add(elementM);
FrameworkElement fe = elementM as FrameworkElement;
if (fe != null)
{
fe.Loaded += (s, e) =>
{
string szTempM = "btnCheckAll";
Button btnCheckAll = CHelper.FindChild<Button>(fe, szTempM);
btnCheckAll.Click += btnCheckAll_Click;
};
}
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