DropDownList[Answered] RSS

• • Reply
  maverick786u...

  Member

  67 Points

  222 Posts

  DropDownList

  Apr 22, 2015 07:08 AM|maverick786us|LINK

  
  I am completely new to MVC forum. I have a list like this.

  public class DomainList
  {
      public string Domain { get; set; }
  }
  
  var DomainList = new List<DomainList>();
  

  Now using foreach loop I am adding string value into this list.

  var DomainList = new List<DomainList>();
  DirectoryEntry en = new DirectoryEntry();
  
  // Search for objectCategory type "Domain"
  DirectorySearcher srch = new DirectorySearcher(en, "objectCategory=Domain");
  SearchResultCollection coll = srch.FindAll();
  
  // Enumerate over each returned domain.
  foreach (SearchResult rs in coll)
       {
            ResultPropertyCollection resultPropColl = rs.Properties;
            foreach (object domainName in resultPropColl["name"])
            {
                 DomainList.Add(new DomainList { Domain = "LDAP://" + domainName.ToString() });
            }
       }
  }

  This list (DomainList) I want to bind with the dropdown. How can I achieve this?

  Doing this with a simple table (which looks like a GridView is very simple, which I am able to achieve using this code.

  <table width="60%" border="0" cellpadding="0" cellspacing="0" class="grid-summarysheet1">
                  <thead>
                      <tr>
                          <th>Domain Name</th>
                          <th>Description</th>
                      </tr>
                  </thead>
                  <tbody>
                      @foreach (var item in Model)
                      {
                          <tr class="altcolor">
                              <td>@Html.ActionLink(@item.Domain, "UserList", new { @domain = @item.Domain })</td>
                              <td>A Corporate domain containing active directory users</td>
                          </tr>
                      }
                  </tbody>
              </table>

  How can I achieve the same thing with a dropdownlist, just like the way I did with a simple Tr Td in the above example??

   

   

   

• • Reply
  A2H

  All-Star

  50841 Points

  9895 Posts

  Re: DropDownList

  Apr 22, 2015 07:39 AM|A2H|LINK

  maverick786us

  This list (DomainList) I want to bind with the dropdown. How can I achieve this?

  You can assign the populated domainlist to a ViewBag like given below

  var DomainList = new List<DomainList>();
  DirectoryEntry en = new DirectoryEntry();
  
  // Search for objectCategory type "Domain"
  DirectorySearcher srch = new DirectorySearcher(en, "objectCategory=Domain");
  SearchResultCollection coll = srch.FindAll();
  
  // Enumerate over each returned domain.
  foreach (SearchResult rs in coll)
       {
            ResultPropertyCollection resultPropColl = rs.Properties;
            foreach (object domainName in resultPropColl["name"])
            {
                 DomainList.Add(new DomainList { Domain = "LDAP://" + domainName.ToString() });
            }
       }
  //Assign the populated values to a viewbag
  ViewBag.domainListItems = DomainList;
  }

  In view then assign the ViewBag values to dropdownlist

  @Html.DropDownList("domainListItems", "Select a Value")

  Check this article for more details

  Thanks,
  Aje
  My Blog | Dotnet Funda
• • Reply
  maverick786u...

  Member

  67 Points

  222 Posts

  Re: DropDownList

  Apr 22, 2015 07:53 AM|maverick786us|LINK

  Thanks for the help. I have one doubt.

  @Html.DropDownList("domainListItems", "Select a Value")

  In this section of code, What should I mention here? When I mention "DomainListItems" it throws an exception stating

  "Exception Details: System.InvalidOperationException: There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'DomainListIteams'."

  So what should I mention there?

• • Reply
  A2H

  All-Star

  50841 Points

  9895 Posts

  Re: DropDownList

  Apr 22, 2015 08:22 AM|A2H|LINK

  You can try with the below code

  var DomainList = new List<DomainList>();
              DirectoryEntry en = new DirectoryEntry();
  
              // Search for objectCategory type "Domain"
              DirectorySearcher srch = new DirectorySearcher(en, "objectCategory=Domain");
              SearchResultCollection coll = srch.FindAll();
               List<SelectListItem> listitems = new List<SelectListItem>();
              // Enumerate over each returned domain.
              foreach (SearchResult rs in coll)
                   {
                        ResultPropertyCollection resultPropColl = rs.Properties;
                        foreach (object domainName in resultPropColl["name"])
                        {
                            //Populate the listitems collections here
                             listitems.Add(new SelectListItem
                              {
                                  Text = "LDAP://" + domainName.ToString(),
                                  Value = "LDAP://" + domainName.ToString()
                              });
                        }
                   }
              //Assign the populated values to a viewbag
              ViewBag.domainListItems = listitems;
              }

  Thanks,
  Aje
  My Blog | Dotnet Funda
• • Reply
  maverick786u...

  Member

  67 Points

  222 Posts

  Re: DropDownList

  Apr 22, 2015 08:56 AM|maverick786us|LINK

  The result is still the same :(. This is the code that I used based on your suggestion

  //var listDomains = new List<SelectListItem>();
              var listDomains = new List<DomainList>();
              DirectoryEntry en = new DirectoryEntry();
  
              // Search for objectCategory type "Domain"
              DirectorySearcher srch = new DirectorySearcher(en, "objectCategory=Domain");
              SearchResultCollection coll = srch.FindAll();
              List<SelectListItem> listitems = new List<SelectListItem>();
  
              //ViewBag.SearchDropdown = new SelectList(coll, "Path", "Path");
              // Enumerate over each returned domain.
              foreach (SearchResult rs in coll)
              {
                  ResultPropertyCollection resultPropColl = rs.Properties;
                  foreach (object domainName in resultPropColl["name"])
                  {
                      //listDomains.Add(new DomainList { Domain = "LDAP://" + domainName.ToString() });
                      listitems.Add(new SelectListItem
                      {
                          Text = "LDAP://" + domainName.ToString(),
                          Value = "LDAP://" + domainName.ToString()
                      });
                  }
              }
              ViewBag.SearchDropdown = listDomains;

  <table width="60%" border="0" cellpadding="0" cellspacing="0" class="grid-summarysheet1">
                  <tbody>
                      <td>
                          @Html.DropDownList("ListIteams", "Select a Value")
                      </td>
                  </tbody>
              </table>

  
  This is the exception :(

  Exception Details: System.InvalidOperationException: There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'ListIteams'.

   

   

   

   

• • Reply
  A2H

  All-Star

  50841 Points

  9895 Posts

  Re: DropDownList

  Apr 22, 2015 09:57 AM|A2H|LINK

  maverick786us

  @Html.DropDownList("ListIteams", "Select a Value")

  You need to assign the viewbag name to your dropdownlist. 

  Change your code like given below

  @Html.DropDownList("SearchDropdown", "Select a Value")

  Thanks,
  Aje
  My Blog | Dotnet Funda
• • Reply
  bruce (sqlwo...

  All-Star

  58144 Points

  15646 Posts

  Re: DropDownList

  Apr 22, 2015 10:54 AM|bruce (sqlwork.com)|LINK

  or:

  <select name="domainList"> 
      @foreach (var item in Model) {
         <option>@item.Domain</option>
      }
  </select>

  bruce (sqlwork.com)
• • Reply
  aliadravi

  Member

  300 Points

  119 Posts

  Re: DropDownList

  Apr 22, 2015 01:51 PM|aliadravi|LINK

  See the best ways to bind the dropdown

  MVC dropdown binding best ways

  MVC DropDownListFor fill on selection change of another dropdown

• • Reply
  maverick786u...

  Member

  67 Points

  222 Posts

  Re: DropDownList

  Apr 23, 2015 12:35 AM|maverick786us|LINK

  Thanks for the help once agian. This is the final code.

  foreach (SearchResult rs in coll)
              {
                  ResultPropertyCollection resultPropColl = rs.Properties;
                  foreach (object domainName in resultPropColl["name"])
                  {
                      //listDomains.Add(new DomainList { Domain = "LDAP://" + domainName.ToString() });
                      listitems.Add(new SelectListItem
                      {
                          Text = "LDAP://" + domainName.ToString(),
                          Value = "LDAP://" + domainName.ToString()
                      });
                  }
              }
              ViewBag.SearchDropdown = listDomains;

  <tbody>
      <td>
            @Html.DropDownList("SearchDropdown", "Select a Value")
      </td>
  </tbody>

  
  Now the only exception that is coming is

  Exception Details: System.InvalidOperationException: The ViewData item that has the key 'SearchDropdown' is of type 'System.Collections.Generic.List`1[[Application.Models.DomainList, Application, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' but must be of type 'IEnumerable<SelectListItem>'.
  
  on this line.
  ...
  Line 13:                 <tbody>
  Line 14:                     <td>
  Line 15:                         @Html.DropDownList("SearchDropdown", "Select a Value")
  Line 16:                     </td>
  Line 17:                 </tbody>

• • Reply
  A2H

  All-Star

  50841 Points

  9895 Posts

  Re: DropDownList

  Apr 23, 2015 12:57 AM|A2H|LINK

  maverick786us

  listitems.Add(new SelectListItem { Text = "LDAP://" + domainName.ToString(), Value = "LDAP://" + domainName.ToString() }); } } ViewBag.SearchDropdown = listDomains;

  You are assigning wrong items to ViewBag, you need to assign listitems instead of listDomains.

  Change your code like given below

  foreach (SearchResult rs in coll)
              {
                  ResultPropertyCollection resultPropColl = rs.Properties;
                  foreach (object domainName in resultPropColl["name"])
                  {
                      //listDomains.Add(new DomainList { Domain = "LDAP://" + domainName.ToString() });
                      listitems.Add(new SelectListItem
                      {
                          Text = "LDAP://" + domainName.ToString(),
                          Value = "LDAP://" + domainName.ToString()
                      });
                  }
              }
              ViewBag.SearchDropdown = listitems;

  • Sample Working Demo
  Thanks,
  Aje
  My Blog | Dotnet Funda
• • Reply
  maverick786u...

  Member

  67 Points

  222 Posts

  Re: DropDownList

  Apr 23, 2015 01:03 AM|maverick786us|LINK

  It worked. Thanks a lot. Can you suggest me some good detailed tutorials or books (PDF of eBook), that gives some basic theoritical overview of MVC 4 architecture for someone like me to start with?

• • Reply
  A2H

  All-Star

  50841 Points

  9895 Posts

  Re: DropDownList

  Apr 23, 2015 01:09 AM|A2H|LINK

  maverick786us

  It worked. Thanks a lot.

  You are welcome

  maverick786us

  Can you suggest me some good detailed tutorials or books (PDF of eBook), that gives some basic theoritical overview of MVC 4 architecture for someone like me to start with?

  If you are looking for hands on  tutorial on how to get started with MVC. Below are two of best hands on sample tutorial available for MVC

  NerdDinner

  • NerdDinner -  Step by step approach for learning MVC with real world example
  • Code Walkthrough of how to build NerdDinner.com

  Music Store

  • MusicStore -have all the basics with examples and have a complete application demo as well

  Also I will provide some additional resources

  The best online Tutorial you will find for MVC none other than this site itself

  • Asp.Net MVC

  If you are looking for E-Learning Tutorial on how to get started with MVC. Please check the below links

  • Asp.Net MVC Tutorials
  • Asp.Net MVC Introduction 
  • MVC Tutorials

  Below are some Video Tutorial links which will help you to get started in MVC

  • Asp.Net MVC Video Tutorials in Channel 9
  • MVC Tutorials from Pluralsight 
  • MVC Tutorials from Asp.net Site

  You can also check the below link which points to 25+ Tutorials and Articles

  • 25+ Best ASP.NET MVC Tutorials and Articles
  • Best of MVC Links - Collection of links which covers most of the topics
  Thanks,
  Aje
  My Blog | Dotnet Funda