System.InvalidCastException: Unable to cast object of type 'System.Int64' to type 'System.String'.

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var result = (from x in dc.PROC_getAppointmentRules() select x).ToList<PROC_getAppointmentRulesResult>();
                return result;

although DB Column is of type Varchar
While executing loop i am getin the exception "System.InvalidCastException: Unable to cast object of type 'System.Int64' to type 'System.String'."

Posted 26-Jan-14 2:13am

Farrukh Hayat Abbasi

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Karthik_Mahalingam 26-Jan-14 8:33am

the property types are not matching..

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OriginalGriff · Answer 1 · 2014-01-26T02:29:00

You need to look at two things:
1) What dc.PROC_getAppointmentRules actually returns.
And
2) What PROC_getAppointmentRulesResult is compared with the return type you declared your method as having.

But why are you doing that at all?

C#

from x in dc.PROC_getAppointmentRules() select x

is the same as calling dc.PROC_getAppointmentRules and casting the result as an IEnumerable. Which it has to be already in order to use it as a Linq source...so what use is this code?

Devil_06 · Answer 2 · 2014-01-26T02:48:00

Solution 2

"System.InvalidCastException: Unable to cast object of type 'System.Int64' to type 'System.String'."
error is mostly given when you have done a type cast error

for example:

string a=Convert.tostring(12);

check your return type because i feel it is returnin an int64 data type and you are trying to save it in a String datatype

Posted 26-Jan-14 2:48am

Devil_06

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Ron Beyer 26-Jan-14 9:06am

Convert.ToString(12) is a valid and workable piece of code that doesn't throw an exception.