System.Collections.Generic.Key...

Question

0.00/5 (No votes)

See more:

I have a web service and am refering the webservice to asp.net code.The asp.et page in which am retrieving the image from server and loading it to iframe but am getting the error but i could not locate the error please suggest. what to do to over come the error.

System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
at System.ThrowHelper.ThrowKeyNotFoundException()
at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
at System.Data.DataView.GetRowView(Int32 record)
at System.Data.DataView.CopyTo(DataRowView[] array, Int32 index)
at System.Data.DataView.GetEnumerator()
at System.Data.DataView.ToTable(String tableName, Boolean distinct, String[] columnNames)
at System.Data.DataView.ToTable()
at Tcss.GetInfoFromLocalAgent.GetDbNameByDesc(String Desc, Int32 LanguageType)
at Tcss.GetInfoFromLocalAgent.GetWidthAndHeightByRowID_BL(Int32 Tpn, Int32 RowID, Int32 LanguageType)
at ShowDoc.Page_Load(Object sender, EventArgs e)

Posted 19-Nov-14 0:28am

karthikeyan9966

Add a Solution

Comments

BillWoodruff 19-Nov-14 7:14am

Without seeing your code, we can only take a wild guess at what's going on. However, the mention of an apparently generic dictionary immediately draws my attention: what is that Dictionary's relation to a DataTable row ?

karthikeyan9966 19-Nov-14 10:54am

can u guess y these occurs

Praveen Kumar Upadhyay 28-Nov-14 1:51am

Please post your code and explain the problem a little more.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Anil Vittal · Answer 1 · 2014-11-27T19:36:00

Hi Karthikeyan,

See below example for how this type of exception occurs.

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace MyAnswers
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {

            Dictionary<int, string> objDic = new Dictionary<int, string>();

            objDic.Add(1, "A");
            objDic.Add(2, "B");

            Console.Write(objDic[3]);//Trying to read the value of a key which does not exist in the dictionary.So exception occurs.
            Console.Read();
            }

            catch(Exception ex)
            {

                Console.Write(ex);
                Console.Read();

            }

        }
    }
}

If we had tried to get the values of the keys 1,2 from the dictionary it would have worked fine.

I hope,now you have understood how this occurs.Debug it and check that from where this problem coming(service side or in your ASP .NET code).

Thanks,
Anil