Object reference not set to an instance of an object while reading file properties from SP2010

Question

I have sharepoint document library which has custom field called "DocumentType" this is not mandatory field. When I am trying to read this property using the below code, when value is there in this field its working fine but where its value empty giving the error "Object reference not set to an instance of an object." If value is not there I need to pass empty string for further logic, how can I handle this?

SPFile spFile=Web.GetFile(Context.Request.Url.ToString());
string spDocumentType=string.Empty;
if (spFile.Properties["DocumentType"].ToString() == "INV") *In this line exception throwing where value is empty in this field in the doc library.
{
spDocumentType = spFile.Properties["DocumentType"].ToString();
}

http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it — Soner Gönül, Apr 12 '14 at 15:58

score 1 · Accepted Answer · answered Apr 12 '14 at 15:55

1

do like this:

if(spFile.Properties["DocumentType"] !=null)
 {
   spDocumentType = spFile.Properties["DocumentType"].ToString() == "INV" ? spFile.Properties["DocumentType"].ToString() : "";

 }
else
{
spDocumentType ="";

}

answered Apr 12 '14 at 15:55

Ehsan Sajjad

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Grant Winney · Answer 2 · 2014-04-12T16:08:51.343

1

Change this piece of code:

spFile.Properties["DocumentType"].ToString()

To this:

Convert.ToString(spFile.Properties["DocumentType"])

While ToString() throws the exception you're getting when the value is null, the Convert.ToString() method tests for null and returns an empty string.

edited Apr 12 '14 at 16:08

answered Apr 12 '14 at 16:03

Grant Winney

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The above both the answer are correct, but its not allowing to accept both the answer. – user1133737 Apr 12 '14 at 17:10

Object reference not set to an instance of an object while reading file properties from SP2010

2 Answers2