Sharepoint Tips n Tricks - Part 2

In continuation with earlier post -
Sharepoint Tips n Tricks

1) Check whether a given SPField exist or not before fetching value from it:

string columnValue = string.Empty;
string columnInternalName = string.Empty;
string fieldName = "Myfield";
SPListItem listItem; //Code to get SPListItem

//Check required SPField exist or not
if (listItem.ParentList.Fields.ContainsField(fieldName))
{
    //Get internal name of SPField   
    columnInternalName = listItem.ParentList.Fields[fieldName].InternalName;

    //Fetch column value based on internal name
    if (listItem[columnInternalName] != null)
        columnValue = listItem[columnInternalName].ToString();
}

2) SharePoint 2007 recommended guidelines for managing site collections, site, lists, and documents according to business needs:

· 50,000 site collections per content database

· 500 MB per site collection (default quota maximum)

· 50 MB file size limit (recommended) up to 2 GB (maximum)

· 2000 items per list view


3) Check whether page is in Edit Mode or not

if (Microsoft.SharePoint.SPContext.Current.FormContext.FormMode == SPControlMode.Display)
{
   // your code to support display mode
}
else if(Microsoft.SharePoint.SPContext.Current.FormContext.FormMode = SPControlMode.Edit)
{
   // your code to support edit mode
}

OR

WebPartManager wp = WebPartManager.GetCurrentWebPartManager(Page);
            
if (wp.DisplayMode == WebPartManager.BrowseDisplayMode)
    btnLink.InnerText = "Edit Page";
else if (wp.DisplayMode == WebPartManager.DesignDisplayMode)
    btnLink.InnerText = "Exit Edit Mode";
else
    btnLink.Visible = false;

Reference...
http://www.codeproject.com/KB/sharepoint/SwitchWPMode.aspx

http://mystepstones.wordpress.com/2008/09/23/detecting-the-current-mode-displayedit/


4) SPFeature to deploy page in a SharePoint site

Feature.xml
<?xml version="1.0" encoding="utf-8"?>
<Feature  Id="f08674ee-2b0e-41aa-8d28-24e788d03c11"
          Title="PageDeployment"
          Description="Description for PageDeployment"
          Version="12.0.0.0"
          Hidden="FALSE"
          Scope="Web"
          DefaultResourceFile="core"
          xmlns="http://schemas.microsoft.com/sharepoint/">
  <ElementManifests>
    <ElementManifest Location="elements.xml"/>
    <ElementFile Location="MyPage.aspx" />
  </ElementManifests>
</Feature>


Elements.xml
<?xml version="1.0" encoding="utf-8" ?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
  <Module  Name="Pages" Path="" Url="">
    <File Name=" MyPage.aspx" Url=" MyPage.aspx" IgnoreIfAlreadyExists="FALSE" NavBarHome="True"></File>
  </Module>
</Elements>