[英]Change inner user control in Silverlight/WPF by a property at design time
[英]change property on user control
我更改了Web用戶控件中的公共屬性,但是客戶端直到我刪除用戶控件並重新添加它然后看到更改后,才能看到該更改。
我在想我自己,如果在許多地方都使用了用戶控件,那我必須對所有頁面都這樣做嗎? 當然,我想念什么嗎?
這是我的webusercontrol的代碼背后:
public partial class ReportExporter : System.Web.UI.UserControl
{
public IEnumerable<object> DataSource { get; set; }
public String ExportFilename { get; set; }
protected void Page_Load(object sender, EventArgs e)
{
}
protected void BtnExportCsv_Click(object sender, EventArgs e)
{
//Client needs to subscribe to this event and set the
//DataSource property with IEnumerable.
//Todo: Find other ways to show this as a requirement.
OnExportEvent(e);
if (String.IsNullOrEmpty(ExportFilename))
ExportFilename = "NeedToOverrideThisName";
Response.Clear();
Response.ContentType = "text/csv";
Response.AddHeader("Content-Disposition", "attachment; filename=" + ExportFilename + ".csv");
byte[] csvData = Utility.ToCsv(",", DataSource.ToList());
Response.OutputStream.Write(csvData, 0, csvData.Length);
HttpContext.Current.Response.End();
}
protected void BtnExportPdf_Click(object sender, EventArgs e)
{
}
public event EventHandler ExportEvent;
protected void OnExportEvent(EventArgs e)
{
if (ExportEvent != null)
{
ExportEvent(this, e);
}
}
}
我所做的就是更改DataSource的屬性名稱,即AnyList。
據我了解,您可以將屬性的值保存在ViewState中,例如:
public String ExportFileName
{
get
{
if (ViewState["ExportFileName_" + this.Id] == null)
return "default_name";
return ViewState["ExportFileName_" + this.Id].ToString();
}
set
{
ViewState["ExportFileName_" + this.Id] = value;
}
}
如果執行這樣的操作,則頁面上可以有多個用戶控件實例,而不會出現問題,因為ViewState Key由用戶控件的Id屬性索引。
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