Saturday, March 27, 2010

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>
 

Code to download document from SharePoint Document Library


Following code snippet demonstrate the way to download a MS Word document (or any file) from SharePoint SPDocumentLibrary-


string siteURL = "http://localhost:80/"; //Write valid site URL
//Get SPSite and SPWeb instance
using (SPSite spSite = new SPSite(sireURL))
{
using (SPWeb spWeb = spSite.OpenWeb())
{
//Get time stamp to download file with unique name
string strFileName = DateTime.Now.ToString("ddMMyyyy_HHmmss");

//Get folder path
string directoryPath =
Path.Combine(Environment.GetFolderPath
(Environment.SpecialFolder.LocalApplicationData),
"MyFolder");

//Create directory if it not exist
if (!(Directory.Exists(directoryPath)))
{
Directory.CreateDirectory(directoryPath);
}

//Get template url
string documentUrl; //Write valid document URL

//Download file in file system
SPFile myFile = spWeb.GetFile(documentUrl);
byte[] binFile = myFile.OpenBinary();

//Generate file name
filename = Path.Combine(directoryPath, strFileName + ".doc");

//Do file write operation
FileStream fs =
new FileStream(filename, FileMode.Create, FileAccess.ReadWrite);
BinaryWriter bw = new BinaryWriter(fs);
bw.Write(binFile);
bw.Close();
}
}

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