Josh's Space

So I just met the static ScriptManager.RegisterStartupScript method!  And it works like a charm!

I was having a terrible time with an AJAX UpdatePanel today!  I had some <script> tags inside of it that would never get executed!  I thought about it for a second, and realize why they didn't - why would they?  I mean the page fully loads, and then there's some javascript action that changes the innerHtml property of a control, of course the content of script tags wouldn't get executed! 

So I did some googling, and it turns out a lot of people had the same question!  How do you execute scripts inside the UpdatePanel?

I was directed to this: ScriptManager.RegisterStartupScript

At first I didn't think it was a static method, so I kept looking around for the method but could find it - and just disregarded the forum posts thinking they were using a BETA version of AJAX.  After doing some digging, I found the methods to be static.

Here is the documentation: http://msdn2.microsoft.com/en-us/library/system.web.ui.scriptmanager.registerstartupscript.aspx

 

My situation involved an UpdatePanel, a RadioButtonList and a MultiView control inside of the Panel.

The RadioButtonList controls the MultiView.ActiveViewIndex.  So there's some really nice updating going on.  However, I needed some javascript code executed if a certain View is active.  I got it working with this static control!  YAY!

 

 

protected void RadioButtonList1_SelectedIndexChange(object sender, EventArgs e)
{

switch (RadioButtonList1.SelectedIndex)
{

case 2:

MultiView1.ActiveViewIndex = 2;

ScriptManager.RegisterStartupScript(UpdatePanel1.FindControl("MultiView1"), typeof(MultiView), "blah", "<script>JavaScriptFunction();</script>", false);

break;

}

}

Recently I was working on a programming project that required me to periodically loop through a Dictionary collection and check values to determine whether or not to keep those items (KeyValuePair) or not.

 

Without thinking, I went ahead and wrote a foreach(KeyValuePair<T, K> pair in MyDictionary), checking with pair.Value, and if it wasn't any good, then calling MyDictionary.Remove(pair.Key). 

 

Easy enough, right?  No.  As you know (I can see the smirk on your face now!) you can't modify the collection while enumerating through it!  Which after thinking about it, makes perfect sense.  So what do you do?  I read a blog post on the internet about a case like this, and the author suggested a couple of ideas:

1. Loop through the collection, and add the valid values to a new collection, and after the loop, replace the old collection with the new.

2. Two loops, the first loop will - NO.  Not an option.  No more than one loop (this is a very simple operation, the code better be too!)

 

I don't like the first idea either.  Two collections and copying back and forth is not acceptable.  Suddenly I realized something: one of the overloads for List<T> is an IEnumerable<T> object, which in the overload will enumerate through and copy (not reference) to the new List<T>.  We could then effectively enumerate through the List<T> and remove what we want from the Dictionary<T, K>.  Honestly, I don't like the idea of creating a whole new list in memory, but in my application the size of it will be very small at all times.  In conclusion this keeps the code simple and gets the job done, which is all I need at the moment.

 

Dictionary<Guid, string> Users;

...

foreach (Guid id in new List<Guid>(Users.Keys))
   if (Users.ContainsKey(id))
      if(Users[id] == null)
         Users.Remove(id);

 

Hello everyone, it's been a while!

I really don't have any code to share this time, nor any cool investing stories to talk about.  Tis the most wonderful time of the year, and I've been spending this Christmas season with my special someone, Emily, and hanging out with my family.  It's been a good time to just catch up and relax from the year's work.  Although last night I went to a local .NET Developer's meeting and learned some more on the XNA Frameork.  I must say, the XNA Framework is one of the most exciting packages I have seen Microsoft release (to me.)  Of course, I haven't been around very long ;)  Anyways, I've been building some samples on the XNA Framework, and I love developing on it.  I will post some code when I get a better understanding of the framework.

I just wanted to with you all a very merry Christmas, and a happy new year!

1. Navigate to: C:\Program Files\Microsoft Visual Studio 8\SDK\v2.0\BootStrapper\Packages\
2. Create a new folder, name it "WindowsMediaEncoder9"
3. Within the newly created folder, create a new file "product.xml"
4. Add the Windows Media Encoder 9 MSI file to the folder (WMEncoder.msi)
5. Create a new folder, name it "en" (for English)
6. Within the newly created folder, create two new files:
• eula.txt
• package.xml

Ok!  Here are the contents of the two XML files.  I just copied the Windows Media Encoder eula to eula.txt.

product.xml:

<?xml version="1.0" encoding="utf-8" ?>
<Product
  xmlns="http://schemas.microsoft.com/developer/2004/01/bootstrapper"
  ProductCode="Widows.Media.Encoder.9">

  <RelatedProducts>
    <DependsOnProduct Code="Microsoft.Windows.Installer.3.1" />
  </RelatedProducts>

  <PackageFiles>
    <PackageFile Name="WMEncoder.msi"/>
  </PackageFiles>

  <InstallChecks>
    <RegistryCheck Property="WMEInstalled"
       Key="HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Media\MsiInstall" Value="WMEncoder" />
  </InstallChecks>

  <Commands>
    <Command PackageFile="WMEncoder.msi" Arguments="">

      <InstallConditions>
        <BypassIf Property="WMEInstalled" Compare="ValueEqualTo" Value="Yes"/>
 <FailIf Property="AdminUser" Compare="ValueNotEqualTo" Value="True"
         String="NotAnAdmin"/>
      </InstallConditions>

      <ExitCodes>
        <ExitCode Value="0" Result="Success"/>
        <ExitCode Value="1641" Result="SuccessReboot"/>
        <ExitCode Value="3010" Result="SuccessReboot"/>
        <DefaultExitCode Result="Fail" String="GeneralFailure"/>
      </ExitCodes>
    </Command>
  </Commands>
</Product>

package.xml:

<?xml version="1.0" encoding="utf-8" ?>
<Package
  xmlns="http://schemas.microsoft.com/developer/2004/01/bootstrapper"
  Name="DisplayName"
  Culture="Culture"
  LicenseAgreement="eula.txt">

  <PackageFiles>
    <PackageFile Name="eula.txt"/>
  </PackageFiles>

  <Strings>
    <String Name="DisplayName">Windows Media Encoder 9</String>
    <String Name="Culture">en</String>
    <String Name="NotAnAdmin">You must be an administrator to install this package.</String>
    <String Name="GeneralFailure">A general error has occurred while
installing this package.</String>
  </Strings>
</Package>

    public string GetMACAddress(string ip)
    {
        string mac = null;
        string line;

        if (File.Exists("C:\\WINDOWS\\system32\\dhcp\\DhcpSrvLog-" + 
            DateTime.Now.DayOfWeek.ToString().Substring(0, 3) + ".log"))
        using (StreamReader read = new StreamReader(
                 File.Open("C:\\WINDOWS\\system32\\dhcp\\DhcpSrvLog-" + 
                 DateTime.Now.DayOfWeek.ToString().Substring(0, 3) + ".log", 
                 FileMode.Open, FileAccess.Read, FileShare.ReadWrite)))
        {
            while (!read.EndOfStream)
            {
                line = read.ReadLine();

                if (line.Contains(ip) && line.Length > 12)
                {
                    mac = line.Substring(line.Length - 13, 12);

                    if (Regex.IsMatch(mac, @"^([A-Z]|\d){12}$"))
                        break;
                }
            }
            
            read.Close();
        }

        return mac;
    }