[ASP.NET]動態Load UserControl – part 2
感謝Allen 郭老師的回應，讓我對自己的CODE再省思了一下，
的確像他說的，若是aspx有註冊user control了，那麼在動態新增user control設定屬性的部分，應該是可以直接宣告該user control的型別來設定屬性，
快超多的…原本的vobjControl.GetType().GetProperty(vstrPropertyName).SetValue(vobjControl, vobjValue, null);還是比較適合不知道control型別時使用。
這邊補上原本作法的改善版。後面會再補上針對郭老師對Unit與enum型別，在SetUserControlProperty()裡是否適用的測試結果。
1.直接使用ASP.usercontrol_custidname_ascx型別。
.ascx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class UserControl_CustIDName : System.Web.UI.UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
}
private PublicEnum.CustType _Custtype;
public PublicEnum.CustType CustType
{
get
{ return _Custtype; }
set
{ _Custtype = value; }
}
private Unit _IDWidth;
public Unit IDWidth
{
get
{ return _IDWidth; }
set
{ _IDWidth = value; }
}
public string CustID
{
get
{ return this.JoeyTextBox1.mTextBox.Text; }
set
{ this.JoeyTextBox1.mTextBox.Text = value; }
}
public string CustName
{
get
{ return this.JoeyTextBox2.mTextBox.Text; }
set
{ this.JoeyTextBox2.mTextBox.Text = value; }
}
public string ValidationGroup
{
get
{ return this.JoeyTextBox1.ValidationGroup; }
set
{
this.JoeyTextBox1.ValidationGroup = value;
this.JoeyTextBox2.ValidationGroup = value;
}
}
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);
this.JoeyTextBox1.Width = this.IDWidth;
}
}.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class LoopAddUserControl_2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
this.DropDownList1.Items.Add(new ListItem("user control index"));
for (int i = 0; i < 10; i++)
{
this.DropDownList1.Items.Add(new ListItem(i.ToString()));
}
}
for (int index = 0; index < 10; index++)
{
//aspx上有註冊UserControl時
ASP.usercontrol_custidname_ascx ctlNewTrial = (ASP.usercontrol_custidname_ascx)this.Page.LoadControl("UserControl/CustIDName.ascx");
ctlNewTrial.ID = "Usrctrl" + index.ToString();
ctlNewTrial.CustID = index.ToString();
ctlNewTrial.CustName = index.ToString() + ":name";
if (index < 5)
{ ctlNewTrial.CustType = PublicEnum.CustType.CompID; }
else
{ ctlNewTrial.CustType = PublicEnum.CustType.CustID; }
ctlNewTrial.IDWidth = Unit.Pixel(16);
//-----------------------------------------------------------------
this.Panel1.Controls.Add(ctlNewTrial);
Label br = new Label();
br.Text = "index=" + index.ToString() + "<br/>";
this.Panel1.Controls.Add(ctlNewTrial);
this.Panel1.Controls.Add(br);
}
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
ASP.usercontrol_custidname_ascx usrctl1 = (ASP.usercontrol_custidname_ascx)this.Panel1.FindControl("Usrctrl" + this.DropDownList1.SelectedValue);
if (usrctl1 != null)
{
this.TextBox1.Text = usrctl1.CustID;
this.TextBox2.Text = usrctl1.CustName;
this.TextBox3.Text = usrctl1.CustType.ToString();
}
else
{
this.TextBox1.Text = string.Empty;
this.TextBox2.Text = string.Empty;
this.TextBox3.Text = string.Empty;
}
}
}在Page_Load的部分根據老師的建議，改成這樣，方便也快很多，相信效率應該也會比較好。
2.使用Control型別，呼叫SetUserControlProperty()設定屬性。
.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class LoopAddUserControl : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
this.DropDownList1.Items.Add(new ListItem("user control index"));
for (int i = 0; i < 10; i++)
{
this.DropDownList1.Items.Add(new ListItem(i.ToString()));
}
}
for (int index = 0; index < 10; index++)
{
//aspx上有註冊UserControl時
//ASP.usercontrol_custidname_ascx ctlNewTrial = (ASP.usercontrol_custidname_ascx)this.Page.LoadControl("UserControl/CustIDName.ascx");
//ctlNewTrial.ID = "Usrctrl" + index.ToString();
//ctlNewTrial.CustID = index.ToString();
//ctlNewTrial.CustName = index.ToString() + ":name";
//if (index < 5)
//{ ctlNewTrial.CustType = PublicEnum.CustType.CompID; }
//else
//{ ctlNewTrial.CustType = PublicEnum.CustType.CustID; }
//-----------------------------------------------------------------
//不知道control型別時
Control ctlNewTrial = this.Page.LoadControl("UserControl/CustIDName.ascx");
SetUserControlProperty(ctlNewTrial, "ID", "Usrctrl" + index.ToString());
SetUserControlProperty(ctlNewTrial, "CustID", index.ToString());
SetUserControlProperty(ctlNewTrial, "CustName", index.ToString()+":name");
//測試enum型別
if (index < 5)
{ SetUserControlProperty(ctlNewTrial, "CustType", PublicEnum.CustType.CompID); }
else
{ SetUserControlProperty(ctlNewTrial, "CustType", PublicEnum.CustType.CustID); }
//測試Unit型別
SetUserControlProperty(ctlNewTrial, "IDWidth", Unit.Pixel(16));
this.Panel1.Controls.Add(ctlNewTrial);
Label br = new Label();
br.Text = "index=" + index.ToString() + "<br/>";
this.Panel1.Controls.Add(ctlNewTrial);
this.Panel1.Controls.Add(br);
}
}
/// <summary>
/// 設定user control的屬性值
/// </summary>
/// <param name="vobjControl">usercontrol by page.loadcontrol()</param>
/// <param name="vstrPropertyName">usercontrol's property</param>
/// <param name="vobjValue">setting property value</param>
/// <remarks></remarks>
public void SetUserControlProperty(Control vobjControl, string vstrPropertyName, object vobjValue)
{
vobjControl.GetType().GetProperty(vstrPropertyName).SetValue(vobjControl, vobjValue, null);
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
ASP.usercontrol_custidname_ascx usrctl1 = (ASP.usercontrol_custidname_ascx)this.Panel1.FindControl("Usrctrl" + this.DropDownList1.SelectedValue);
if (usrctl1 != null)
{
this.TextBox1.Text = usrctl1.CustID;
this.TextBox2.Text = usrctl1.CustName;
this.TextBox3.Text = usrctl1.CustType.ToString();
}
else
{
this.TextBox1.Text = string.Empty;
this.TextBox2.Text = string.Empty;
this.TextBox3.Text = string.Empty;
}
}
}
結果1，選擇index<5的：Unit的部分，可以在動態產生的UserControl，CustID textbox的width獲得證明。
選index<5的，則是CustType應為CompID。
結果2，選擇index>5的：選index>5的，則是CustType應為CustID。
疑問：如果不想再aspx上註冊UserControl，那讀值的時候，除了用Control型別的GetValue，還有其他方式嗎？？
補上User control互動的參考：WebUserControl之間值得傳遞(使用Interface)
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