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How do I pass an array of objects to my (code behind) accessor method in ASP.Net?

Posted on 2011-02-11
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Last Modified: 2012-05-11
Hey Guys:

Hope y'all doing well.

I've got an ASP .Net/C# question

I've got the following accessor method on my base page code behind:
-------------------------------------------------------------------
public static string RetrieveTimeStampFromAudit (AuditRecord[] auditHistory, string operationTypeStringToFind, string format)
{
//TODO Add implementation
}

I'd like to be able to call it from my ASP.Net page, more or less
in the following fashion:
-----------------------------------------------------------------
Text='<%# RetrieveTimeStampFromAudit("Foobar.AuditRecord", "Created", "MM/dd/yyyy") %>'

 
I'm getting casting errors at page load time.
I’ve tried changing the Method definition to
                Object
                Object[]

and playing with the the actual call on the Asp .Net page.

Do you have any suggestions how to manipulate this cast/definition to work?

Thanks,
JB
0
Comment
Question by:jxbma
  • 3
4 Comments
 
LVL 12

Expert Comment

by:starlite551
ID: 34876769
Hi JB, Can you post the complete code for this method : RetrieveTimeStampFromAudit()
I have a Solution for You Plz try this code :

 
Text='<% (string)RetrieveTimeStampFromAudit("Foobar.AuditRecord", "Created", "MM/dd/yyyy") %>'

//OR

Text='<% RetrieveTimeStampFromAudit("Foobar.AuditRecord", "Created", "MM/dd/yyyy").ToString() %>'

//OR

Text='<%# (string)RetrieveTimeStampFromAudit("Foobar.AuditRecord", "Created", "MM/dd/yyyy") %>'


//OR

Text='<%# RetrieveTimeStampFromAudit("Foobar.AuditRecord", "Created", "MM/dd/yyyy").ToString() %>'

//OR

Text='<%# RetrieveTimeStampFromAudit("Foobar.AuditRecord", "Created", "MM/dd/yyyy") as String %>'

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One of the above declarations may definitely work for you.. See since the return type of this method is a string I think it would definitely be necessary to cast it to a string object.
0
 
LVL 12

Accepted Solution

by:
starlite551 earned 500 total points
ID: 34876786
Hey I am sorry I did not notice a simple mistake that you have committed in the code block.. You have specified the first parameter as a string in the method whereas it should have been an Array object of AuditRecord class.. So the code would change to this :
Text='<% (string)RetrieveTimeStampFromAudit(Foobar.AuditRec, "Created", "MM/dd/yyyy") %>'

//OR

Text='<% RetrieveTimeStampFromAudit(Foobar.AuditRec, "Created", "MM/dd/yyyy").ToString() %>'

//OR

Text='<%# (string)RetrieveTimeStampFromAudit(Foobar.AuditRec, "Created", "MM/dd/yyyy") %>'


//OR

Text='<%# RetrieveTimeStampFromAudit(Foobar.AuditRec, "Created", "MM/dd/yyyy").ToString() %>'

//OR

Text='<%# RetrieveTimeStampFromAudit(Foobar.AuditRec, "Created", "MM/dd/yyyy") as String %>'

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Here I assume Foobar.AuditRec is of the type AuditRecord[] like so :
public class Foobar
{
      public Foobar()
      {
          //Default Constructor..
      } 
      public Foobar(int size)
      {
           auditRec = new AuditRecord[size];
           //Manipulation code below here.. via AuditRec property
      }  
      private AuditRecord[] auditRec;

      public AuditRecord[] AuditRec
      {
            get 
            {
                 return auditRec;
            } 
            set
            {
                 auditRec = value; 
            }  
      }

}

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0
 
LVL 12

Expert Comment

by:starlite551
ID: 34876799
Final Comment : Change the first parameter of the method :

public static string RetrieveTimeStampFromAudit (AuditRecord[] auditHistory, string operationTypeStringToFind, string format)
{
//TODO Add implementation
}

Open in new window


To an object of AuditRecord[] class like this one for example :

 
AuditRecord[] obj = new AuditRecord[10];

string test = RetrieveTimeStampFromAudit(obj,"Created","MM/dd/yyyy");

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I think thats your issue..Its not able to cast the string "Foobar.AuditRecord" into an object of type AuditRecord[]
0
 
LVL 5

Expert Comment

by:aternex
ID: 34877037
Also, keep in mind you are using
Text='<%# RetrieveTimeStampFromAudit("Foobar.AuditRecord", "Created", "MM/dd/yyyy") %>'

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to call your method. Depending on where that code appears in  your asp.net page, this may not work. Using the # will only work inside of a databound control, otherwise you would use
Text='<%= RetrieveTimeStampFromAudit("Foobar.AuditRecord", "Created", "MM/dd/yyyy") %>'

Open in new window

. I'm just throwing this out there, but it doesn't sound like it would produce the error you are receiving.
0

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