在asp.net c＃中，如何在单击“提交”按钮后获取动态创建的控件的值
[英]in asp.net c# how to get the value of dynamically created controls after clicking submit button
问题描述
In my aspx page I have a panel(generic panel). 
在我的aspx页面中，有一个面板（通用面板）。 This one is populate by several panels build dynamically. 这是由几个动态构建的面板填充的。 Each inside panel contains one label (id = "lbl"+ i.ToString()) , one photo (id = "img"+ i.ToString()) and one button submit ("btn" + i.ToString()) created dynamically and populate with sql data. 每个内部面板包含一个标签(id = "lbl"+ i.ToString()) ，一张照片(id = "img"+ i.ToString())和一个按钮提交("btn" + i.ToString())动态创建并填充sql数据。 When the submit button is clicked, I would like to display the name in the label in an update panel beside the generic panel. 单击提交按钮后，我想在通用面板旁边的更新面板的标签中显示名称。 How can I do that? 我怎样才能做到这一点？ Is somebody have a solution? 有人有解决办法吗？ Thanks a lot for your help My aspx file 非常感谢您的帮助我的aspx文件
<asp:Panel ID="Panel_Generic" runat="server" Style="margin-left:30px;margin-right:30px;">
<div class="row">
<div class="col-lg-12">
<h2 class="page-header">
Vente à emporter
<small>Restaurant</small>
</h2>
<ol class="breadcrumb">
<li>
<i class="fa fa-dashboard"></i>Vos Informations
</li>
<li>
<i class="fa fa-file"></i> Votre commande
</li>
<li class="active">
<i class="fa fa-file"></i> Valider
</li>
</ol>
</div>
</div>
<div style="display:flex;justify-content:space-around;margin-bottom:30px">
<asp:Button ID="btn_Entree" width="150px" class="btn btn-info btn-lg" runat="server" Text="Entrées" />
<asp:Button ID="btn_Plat" width="150px" class="btn btn-warning btn-lg" runat="server" Text="Plats" />
<asp:Button ID="btn_dessert" width="150px" class="btn btn-success btn-lg" runat="server" Text="Desserts" />
<asp:Button ID="btn_boisson" width="150px" class="btn btn-primary btn-lg" runat="server" Text="Boissons" />
</div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<div>
<asp:Panel ID="Panel_Entree" class="col-md-9" runat="server" style="display:flex;flex-wrap:wrap">
</asp:Panel>
<asp:UpdatePanel ID="UpdatePanel1" class="col-md-3" runat="server">
<ContentTemplate>
<div class="panel panel-danger">
<div class="panel-heading">A emporter</div>
<div class="panel-body">
<asp:Button ID="Button1" class="btn btn-danger btn-lg" runat="server" Text="Valider votre commande" style="justify-content:center"/>
<div style="border-bottom:1px solid black;margin-top:20px"></div>
<div>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</div>
</div>
</div>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</asp:Panel>
My code behind 我背后的代码
string constr = ConfigurationManager.ConnectionStrings["restau"].ConnectionString;
protected void Page_Load(object sender, EventArgs e)
{
//if (!IsPostBack)
//{
BindEntree();
//}
}
protected void BindEntree()
{
SqlConnection con = null;
SqlCommand cmd = null;
SqlDataAdapter sda = new SqlDataAdapter();
DataSet ds = new DataSet();
string strQuery = "select * from recette_restau2 where type_plat='entree' and prix_vente is not null and nbre_pers is not null and picture is not null";
con = new SqlConnection(constr);
try
{
con.Open();
cmd = new SqlCommand(strQuery, con);
sda.SelectCommand = cmd;
sda.Fill(ds, "TableEntree");
for (int i = 0; i < ds.Tables["TableEntree"].Rows.Count; i++)
{
byte[] barrImg = (byte[])ds.Tables["TableEntree"].Rows[i][15];
if (barrImg != null && barrImg.Length > 0)
{
int identree = Convert.ToInt16(ds.Tables["TableEntree"].Rows[i][0]);
string base64String = Convert.ToBase64String(barrImg, 0, barrImg.Length);
System.Web.UI.HtmlControls.HtmlGenericControl divEntree = new System.Web.UI.HtmlControls.HtmlGenericControl("div");
divEntree.Attributes.Add("class", "panel panel-body");
divEntree.Style.Add("Border", "1px solid #C7CAC9");
divEntree.Style.Add("BorderColor", "red");
divEntree.Style.Add("width", "350px");
divEntree.Style.Add("height", "350px");
divEntree.Style.Add("margin-right", "20px");
divEntree.Style.Add("margin-bottom", "20px");
divEntree.Style.Add("display", "flex");
divEntree.Style.Add("flex-direction", "column");
divEntree.Style.Add("justify-content", "space-between");
System.Web.UI.HtmlControls.HtmlGenericControl divInfo = new System.Web.UI.HtmlControls.HtmlGenericControl("div");
System.Web.UI.HtmlControls.HtmlGenericControl divTitrePrix = new System.Web.UI.HtmlControls.HtmlGenericControl("div");
divTitrePrix.Style.Add("display", "flex");
divTitrePrix.Style.Add("justify-content", "space-between");
Label lblTitre = new Label();
lblTitre.ID = "lblTitre" + i.ToString();
lblTitre.Style.Add("font-size", "1.5em");
lblTitre.Style.Add("margin-bottom", "10px");
lblTitre.Text = Convert.ToString(ds.Tables["TableEntree"].Rows[i][2]);
//Label lblObserv = new Label();
//lblObserv.ID = "lblObserv" + i.ToString();
//lblObserv.Text = Convert.ToString(ds.Tables["TableEntree"].Rows[i][16]);
TextBox lblPrix = new TextBox();
lblPrix.ID = "lblPrix" + i.ToString();
lblPrix.Style.Add("font-size", "1.1em");
lblPrix.Style.Add("margin-bottom", "10px");
lblPrix.Style.Add("height", "30px");
lblPrix.Style.Add("width", "70px");
lblPrix.Style.Add("color", "white");
lblPrix.Style.Add("background-color", "red");
lblPrix.Style.Add("justify-content", "center");
lblPrix.Style.Add("align-items", "center");
lblPrix.Style.Add("text-align", "center");
lblPrix.Attributes.Add("ReadOnly", "true");
lblPrix.Attributes.Add("enabled", "false");
lblPrix.Text = Convert.ToString(ds.Tables["TableEntree"].Rows[i][4] + " €");
Image ImageEntree = new Image();
ImageEntree.ImageUrl = "data:image/jpg;base64," + base64String;
ImageEntree.Style.Add("width", "50%");
ImageEntree.Style.Add("height", "50%");
ImageEntree.Style.Add("margin-right", "10px");
System.Web.UI.HtmlControls.HtmlGenericControl divChoix = new System.Web.UI.HtmlControls.HtmlGenericControl("div");
divChoix.Style.Add("display", "flex");
divChoix.Style.Add("justify-content", "center");
divChoix.Style.Add("align-items", "center");
System.Web.UI.HtmlControls.HtmlGenericControl divBtnMinusPlus = new System.Web.UI.HtmlControls.HtmlGenericControl("div");
divBtnMinusPlus.Attributes.Add("class", "input-group");
divBtnMinusPlus.Style.Add("margin-right", "10px");
System.Web.UI.WebControls.Image img1 = new System.Web.UI.WebControls.Image();
img1.ID = "img1" + i.ToString();
img1.Attributes.Add("width", "15px");
img1.Attributes.Add("height", "15px");
img1.Attributes.Add("OnClick", "img1_Click");
img1.ImageUrl = "Content/images/moins_rond.png";
System.Web.UI.WebControls.Image img2 = new System.Web.UI.WebControls.Image();
img2.ID = "img2" + i.ToString();
img2.Attributes.Add("OnClick", "img2_Click");
img2.ImageUrl = "Content/images/plus_rond.png";
img2.Attributes.Add("width", "15px");
img2.Attributes.Add("height", "15px");
TextBox txtBoxNbre = new TextBox();
txtBoxNbre.ID = "txtBoxNbre" + i.ToString();
txtBoxNbre.Style.Add("width", "50px");
txtBoxNbre.Style.Add("text-align", "center");
AjaxControlToolkit.NumericUpDownExtender numericExtender = new AjaxControlToolkit.NumericUpDownExtender();
numericExtender.ID = "numericExtender" + i.ToString();
numericExtender.Width = 80;
numericExtender.Minimum = 1;
numericExtender.Maximum = 20;
numericExtender.TargetButtonUpID = "img2" + i.ToString();
numericExtender.TargetButtonDownID = "img1" + i.ToString();
numericExtender.TargetControlID = "txtBoxNbre" + i.ToString();
divBtnMinusPlus.Controls.Add(img1);
divBtnMinusPlus.Controls.Add(txtBoxNbre);
divBtnMinusPlus.Controls.Add(img2);
divBtnMinusPlus.Controls.Add(numericExtender);
Button btnPrix = new Button();
btnPrix.ID = "btnPrix" + i.ToString();
//btnPrix.Attributes.Add("Class", "btn btn-danger hvr-icon-forward");
btnPrix.CssClass = "btn btn-danger hvr-icon-forward";
btnPrix.Attributes.Add("runat", "server");
btnPrix.Text = "Choisir";
btnPrix.Click += new System.EventHandler(btnPrix_Click);
//btnPrix.CommandArgument = "<%# Eval('id_recette') %>";
HiddenField hf = new HiddenField();
hf.ID = "hf" +i.ToString();
hf.Value = Convert.ToString(ds.Tables["TableEntree"].Rows[i][0]);
divTitrePrix.Controls.Add(lblTitre);
divTitrePrix.Controls.Add(lblPrix);
divInfo.Controls.Add(divTitrePrix);
//divInfo.Controls.Add(lblObserv);
divEntree.Controls.Add(divInfo);
divEntree.Controls.Add(new LiteralControl("<br />"));
divChoix.Controls.Add(ImageEntree);
divChoix.Controls.Add(divBtnMinusPlus);
divEntree.Controls.Add(divChoix);
divEntree.Controls.Add(new LiteralControl("<br />"));
divEntree.Controls.Add(btnPrix);
divEntree.Controls.Add(hf);
Panel_Entree.Controls.Add(divEntree);
protected void btnPrix_Click(object sender, EventArgs e)
{
try
{//string s = (sender as Button).Text;
Button btn = (Button)sender;
string id = btn.CommandArgument;
Label1.Text = id;
}
catch (Exception ex)
{
Label2.Text = ex.Message.ToString();
}
}
2 个解决方案
解决方案1
0 2017-06-21 15:55:28
It should be something like 应该是这样的
for (int i=1; i<=5; i++)
{
Label myLabel = new Label();
// Set the label's Text and ID properties.
myLabel.Text = "Label" + i.ToString();
myLabel.ID = "Label" + i.ToString();
PlaceHolder1.Controls.Add(myLabel);
// Add a spacer in the form of an HTML <br /> element.
PlaceHolder1.Controls.Add(new LiteralControl("<br />"));
}
it create dynamic labels with ids label1,label2 & so on 它创建ID为label1，label2等的动态标签
if you want to create dynamic button and its click so 如果您要创建动态按钮及其点击，
Button btn = new Button();
btn.ID = "btnSubmit";
btn.Text = "Submit";
btn.Click += new EventHandler(btnSubmit_Click);
this.Controls.Add(btn);
You will need event handler btnSubmit_Click to add click event to the button 您将需要事件处理程序btnSubmit_Click将click事件添加到按钮
hope this will help 希望这会有所帮助
解决方案2
0 2017-06-21 16:27:40
I may have misunderstood your intention but I think this will do what you ask. 我可能误解了您的意图，但是我认为这可以满足您的要求。
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindEntree();
}
else
{
Label1.Text = TextBox1.Text;
}
}
* you will have to eliminate the text value of your label: *您将必须消除标签的文本值：
<asp:Label ID="Label1" runat="server" ></asp:Label>
Bear in mind there are several ways of doing this and this is rather crude but it will give you an idea how the postback works with update panels.. 请记住，有几种方法可以做到这一点，虽然这很粗糙，但是它将使您了解回发如何与更新面板一起使用。
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