C# usercontrol的公共字符串没有显示任何内容?
在my usercontrolC# usercontrol的公共字符串没有显示任何内容?,c#,wpf,linq,xaml,user-controls,C#,Wpf,Linq,Xaml,User Controls,在my usercontrolViewUser中,groupbox标题和textblock没有显示用户ID 主窗口: private void btnGeneral_Click(object sender, RoutedEventArgs e) { ViewUser myusercontrol = new ViewUser(); String id = (String)((Button)sender).Tag; myusercontrol.UserID = id;
ViewUser
中,groupbox标题和textblock没有显示用户ID
主窗口:
private void btnGeneral_Click(object sender, RoutedEventArgs e)
{
ViewUser myusercontrol = new ViewUser();
String id = (String)((Button)sender).Tag;
myusercontrol.UserID = id;
PanelMainContent.Children.Add(myusercontrol);
}
private void button1_Click(object sender, RoutedEventArgs e)
{
string uriUsers = "http://localhost:8000/Service/User";
XDocument xDoc = XDocument.Load(uriUsers);
var sortedXdoc = xDoc.Descendants("User")
.OrderByDescending(x => Convert.ToDateTime(x.Element("TimeAdded").Value));
foreach (var node in xDoc.Descendants("User"))
{
Button btnFindStudent = new Button();
btnUser.Click += this.btnGeneral_Click;
btnUser.Tag = String.Format(node.Element("UserID").Value);
//also tryed btnUser.Tag = node.Element("UserID").Value;
用户控制:
public partial class ViewUser : UserControl
{
public ViewUser()
{
InitializeComponent();
}
private string _user;
public string UserID
{
get { return _userID; }
set { _userID = value; }
}
protected override void OnInitialized(EventArgs e)
{
base.OnInitialized(e);
groupBox1.Header = UserID;
textBlock1.Text = UserID;
}
}
}在设置UserID之前,您正在设置groupBox1.Header和textBlock1.Text。两种选择: 覆盖OnPreRender并在其中设置它们 或 直接从属性设置它们:
public string UserID
{
get { return textBlock1.Text; }
set
{
textBlock1.Text = value;
groupBox1.Header = value;
}
}
Kirsty,您应该在每次用户ID属性更改时更新GroupBox和TextBlock:
public string UserID
{
get { return _userID; }
set
{
_userID = value;
groupBox1.Header = _userID;
textBlock1.Text = _userID;
}
}
目前,您仅在OnInitialized中更新了一次GroupBox和TextBlock。但是OnInitialized只在ViewUser控件初始化后调用一次,以后不再调用
这就是n8wrl回答第二部分的意思。base.OnPreRender(e);不存在?也没有适合onprerenderOh拍摄的方法-我想的是ASP.NET。不管怎样,我确信在控制生命周期中也有类似的东西。尝试“从属性设置”选项我严重困惑是否无法设置它,因此当我单击“查看”按钮时,它将根据字符串自动填充字段?