How do i solve this error "system.invalidcastexception unable to cast object of type 'system.int64' to type 'system.string' "

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C#

protected string gridValueChopping(object dataItem, string dataField, int iSize)
    {
        string gridValue = (string)DataBinder.Eval(dataItem, dataField);
        string output = string.Empty;
        if (gridValue.Length > iSize)
        {
            output = ((string)DataBinder.Eval(dataItem, dataField)).Substring(0, iSize - 3);
            output = output + "...";
        }
        else
        {
            output = (string)DataBinder.Eval(dataItem, dataField).ToString();
        }
        return output;
    }

I am getting the "system.invalidcastexception unable to cast object of type 'system.int64' to type 'system.string'"error in the following line of the above mentioned code -

string gridValue = (string)DataBinder.Eval(dataItem, dataField);

can I get a solution for this?

What I have tried:

C#

string gridValue = (string)DataBinder.Eval(dataItem, dataField);

I changed this line as,

C#

string gridValue = (string)DataBinder.Eval(dataItem, dataField).ToString;

but even then the error repeats..

Posted 8-Mar-16 0:09am

Member 12377290

Updated 8-Mar-16 0:55am

Andy Lanng

v2

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Comments

Jochen Arndt 8-Mar-16 6:27am

Are the missing parentheses for ToString in the changed line a typo?
It should be:
string gridValue = DataBinder.Eval(dataItem, dataField).ToString();

Member 12377290 9-Mar-16 6:36am

I tried this, but it didnt workout.. solution given by Richard Deeming helped me.

2 solutions

Solution 1

C#

long longValue = (long)DataBinder.Eval(dataItem, dataField);
string gridValue = longValue.ToString();

should do it, or at least should allow to better understand where the problem lies.

Posted 8-Mar-16 0:23am

phil.o

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

Richard Deeming · Accepted Answer · 2016-03-08T00:48:00

Another alternative:

C#

string gridValue = DataBinder.Eval(dataItem, dataField, "{0}");

Also, don't Eval the same value multiple times; use the value retrieved from the first call to Eval instead:

C#

protected string gridValueChopping(object dataItem, string dataField, int iSize)
{
    string gridValue = DataBinder.Eval(dataItem, dataField, "{0}");
    string output;
    
    if (gridValue.Length > iSize)
    {
        output = gridValue.Substring(0, iSize - 3);
        output = output + "...";
    }
    else
    {
        output = gridValue;
    }
    
    return output;
}

How do i solve this error "system.invalidcastexception unable to cast object of type 'system.int64' to type 'system.string' "

2 solutions

Solution 2

Solution 1

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How do i solve this error "system.invalidcastexception unable to cast object of type 'system.int64' to type 'system.string' "

2 solutions

Solution 2

Solution 1

Add your solution here

Preview 0

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