单选按钮列表选择的值在asp.net中不是持久的 [英] Radio button list selected value not persistent in asp.net
本文介绍了单选按钮列表选择的值在asp.net中不是持久的的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有两个动态填充的单选按钮列表。第一个按钮单击时填充第一个，第一个单选按钮列表的更改事件中的另一个填充。问题只出在第二个列表中。问题是我无法在InsertButton_Click方法中检索第二个单选按钮列表的更改值（标记为**）。它总是返回默认索引值，即0.我在page_load事件中没有任何内容。我读了很多类似的问题，但似乎都没有帮助。请指导。下面是相同的asp和c＃代码：
ASP：
< asp：按钮 id = SaveButton
< span class =code-attribute> 文本 = 保存
runat = server onclick = SaveButton_Click >
< / asp：按钮 >
< asp：Button id = VisualiseButton
文字 = 可视化
runat = server onclick = VisualiseButton_Click >
< / asp ：按钮 >
< asp：RadioButtonList id = RadioButtonList2 runat < span class =code-keyword> = ser ver 可见 = false
< span class =code-attribute> onselectedindexchanged = RadioButtonList2_SelectedIndexChanged > < / asp：RadioButtonList >
< asp： RadioButtonList id = RadioButtonList1 runat = server 可见 = false > < / asp：RadioButtonList >
< asp：按钮 id = SaveToDBButton
文字 = 插入
runat = server 可见 = false < span class =code-attribute> onclick = InsertButton_Click >
C＃：
protected void SaveButton_Click（ object sender，EventArgs e）
{
字符串 selQuery = SELECT id，name FR OM类别;
尝试
{
con.Open（）;
SqlDataAdapter da = new SqlDataAdapter（selQuery，con）;
DataTable dt = new DataTable（）;
da.Fill（dt）;
RadioButtonList2.DataSource = dt;
RadioButtonList2.DataTextField = name;
RadioButtonList2.DataValueField = id;
RadioButtonList2.DataBind（）;
RadioButtonList2.RepeatColumns = 3 ;
RadioButtonList2.AutoPostBack = true ;
RadioButtonList2.Visible = true ;
}
catch （SqlException ex）
{
}
最后
{
如果（con！ = null ）
{
con.Close（）;
}
}
}
受保护 void RadioButtonList2_SelectedIndexChanged（ object sender，EventArgs e）
{
String catId = RadioButtonList2.SelectedValue;
SqlCommand cmdselect = new SqlCommand（ SELECT DISTINCT categoryId，linkTablesCategories.tableName，tableDescription FROM linkTablesCategories，tableDescriptions其中linkTablesCategories.tableName = tableDescriptions.tableName和categoryId =' + catId + '）;
RadioButtonList1.Items.Clear（）;
尝试
{
con.Open（）;
cmdselect.Connection = con;
SqlDataReader dar = cmdselect.ExecuteReader（）;
if （dar.HasRows）
{
while （dar .Read（））
{
ListItem li = new ListItem（dar [ tableName]。ToString（），dar [ 。的categoryId]的ToString（））;
li.Attributes.Add（ title，dar [ tableDescription]。ToString（））;
RadioButtonList1.Items.Add（li）;
}
}
RadioButtonList1.Visible = true ;
SaveToDBButton.Visible = true ;
}
catch （SqlException ex）
{
// lblMessage.Text = ex.Message;
}
finally
{
cmdselect.Dispose（）;
if （con！= null ）
{
con。关（）;
}
}
}
受保护 void InsertButton_Click（ object sender，EventArgs e）
{
String tableId = ;
** tableId = RadioButtonList1.SelectedItem.Text; **
String path = Server.MapPath（ 〜/）;
string filepath = path + Session [ 。文件路径]的ToString（）;
StreamReader sr = new StreamReader（filepath）;
string line = sr.ReadLine（）;
string [] value = line.Split（' ，'）;
DataTable dt = new DataTable（）;
DataRow行;
foreach （字符串 dc value ）
{
dt.Columns.Add（ new DataColumn（dc ））;
}
while （！sr.EndOfStream）
{
value = sr.ReadLine（）。分割（' ，'）;
if （ value .Length == dt.Columns.Count）
{
row = dt.NewRow（）;
row.ItemArray = value ;
dt.Rows.Add（row）;
}
}
SqlBulkCopy bc = new SqlBulkCopy（con.ConnectionString，SqlBulkCopyOptions.TableLock）;
bc.DestinationTableName = tableId;
bc.BatchSize = dt.Rows.Count;
con.Open（）;
bc.WriteToServer（dt）;
bc.Close（）;
con.Close（）;
}
解决方案
嘿，刚刚遇到问题，就是这行：
< pre lang =c＃> ListItem li = new ListItem（dar [ tableName]。ToString（），dar [ categoryId] .ToString（））;
categoryId是一个常数值因此问题，再次是我的坏。
谢谢
I have two dynamically populated radio button lists. The first one gets populated on a button click, the other one on the change event of the first radio button list. The problem is only with the second list. The issue is that I am not able to retrieve the changed value of the second radio button list in the InsertButton_Click method(marked by **). It always returns the default index value i.e 0. I don''t have anything in page_load event. I read quite a few similar questions but none seem to help. Please guide. Below is the asp and c# code for the same:
ASP:
<asp:Button id="SaveButton"
Text="Save"
runat="server" onclick="SaveButton_Click">
</asp:Button>
<asp:Button id="VisualiseButton"
Text="Visualise"
runat="server" onclick="VisualiseButton_Click">
</asp:Button>
<asp:RadioButtonList id="RadioButtonList2" runat="server" Visible="false"
onselectedindexchanged="RadioButtonList2_SelectedIndexChanged" ></asp:RadioButtonList>
<asp:RadioButtonList id="RadioButtonList1" runat="server" Visible="false" ></asp:RadioButtonList>
<asp:Button id="SaveToDBButton"
Text="Insert"
runat="server" Visible="false" onclick="InsertButton_Click">
C#:
protected void SaveButton_Click(object sender, EventArgs e)
{
String selQuery = "SELECT id, name FROM categories";
try
{
con.Open();
SqlDataAdapter da = new SqlDataAdapter(selQuery, con);
DataTable dt = new DataTable();
da.Fill(dt);
RadioButtonList2.DataSource = dt;
RadioButtonList2.DataTextField = "name";
RadioButtonList2.DataValueField = "id";
RadioButtonList2.DataBind();
RadioButtonList2.RepeatColumns = 3;
RadioButtonList2.AutoPostBack = true;
RadioButtonList2.Visible = true;
}
catch (SqlException ex)
{
}
finally
{
if (con != null)
{
con.Close();
}
}
}
protected void RadioButtonList2_SelectedIndexChanged(object sender, EventArgs e)
{
String catId = RadioButtonList2.SelectedValue;
SqlCommand cmdselect = new SqlCommand("SELECT DISTINCT categoryId, linkTablesCategories.tableName, tableDescription FROM linkTablesCategories, tableDescriptions where linkTablesCategories.tableName = tableDescriptions.tableName and categoryId ='" + catId + "'");
RadioButtonList1.Items.Clear();
try
{
con.Open();
cmdselect.Connection = con;
SqlDataReader dar = cmdselect.ExecuteReader();
if (dar.HasRows)
{
while (dar.Read())
{
ListItem li = new ListItem(dar["tableName"].ToString(), dar["categoryId"].ToString());
li.Attributes.Add("title", dar["tableDescription"].ToString());
RadioButtonList1.Items.Add(li);
}
}
RadioButtonList1.Visible = true;
SaveToDBButton.Visible = true;
}
catch (SqlException ex)
{
//lblMessage.Text = ex.Message;
}
finally
{
cmdselect.Dispose();
if (con != null)
{
con.Close();
}
}
}
protected void InsertButton_Click(object sender, EventArgs e)
{
String tableId="";
**tableId = RadioButtonList1.SelectedItem.Text;**
String path = Server.MapPath("~/");
string filepath = path + Session["filepath"].ToString();
StreamReader sr = new StreamReader(filepath);
string line = sr.ReadLine();
string[] value = line.Split(',');
DataTable dt = new DataTable();
DataRow row;
foreach (string dc in value)
{
dt.Columns.Add(new DataColumn(dc));
}
while (!sr.EndOfStream)
{
value = sr.ReadLine().Split(',');
if (value.Length == dt.Columns.Count)
{
row = dt.NewRow();
row.ItemArray = value;
dt.Rows.Add(row);
}
}
SqlBulkCopy bc = new SqlBulkCopy(con.ConnectionString, SqlBulkCopyOptions.TableLock);
bc.DestinationTableName = tableId;
bc.BatchSize = dt.Rows.Count;
con.Open();
bc.WriteToServer(dt);
bc.Close();
con.Close();
} 解决方案
Hey just got the issue, it was with the line:
ListItem li = new ListItem(dar["tableName"].ToString(), dar["categoryId"].ToString());
The categoryId was a constant value and thus the issue, again my bad.
Thanks
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