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Invalid cast from 'System.Int32' to Enum using reflections


By : Mayhew
Date : September 29 2020, 06:00 AM
To fix this issue You could check prop.PropertyType.IsEnum in an if statement and use Enum.ToObject like so:
code :
if (prop.PropertyType.IsEnum)
{
    return Enum.ToObject(prop.PropertyType, value);
}
else
{
    return Convert.ChangeType(value, prop.PropertyType);
}


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subsonic Invalid cast from System.Int32 to System.Byte[]


By : TungMing
Date : March 29 2020, 07:55 AM
like below fixes the issue Subsonic 2.2 is throwing the error , The SubSonic object was initialized incorrectly.
Solution
code :
Dim template as New TemplateDocument(Guid.NewID()) with {.content = Nothing}

System.InvalidCastException: Invalid cast from 'DateTime' to 'Int32'. nhibernate


By : mhhack
Date : March 29 2020, 07:55 AM
this will help The problem is the mapping. See the documentation: 6.3. Collections of Values and Many-To-Many Associations
Extract:

Invalid cast from 'System.Int32' to 'System.Nullable`1[[System.Int32, mscorlib]]


By : yengying Hoong
Date : March 29 2020, 07:55 AM
This might help you You have to use Nullable.GetUnderlyingType to get underlying type of Nullable.
This is the method I use to overcome limitation of ChangeType for Nullable
code :
public static T ChangeType<T>(object value) 
{
   var t = typeof(T);

   if (t.IsGenericType && t.GetGenericTypeDefinition().Equals(typeof(Nullable<>))) 
   {
       if (value == null) 
       { 
           return default(T); 
       }

       t = Nullable.GetUnderlyingType(t);
   }

   return (T)Convert.ChangeType(value, t);
}
public static object ChangeType(object value, Type conversion) 
{
   var t = conversion;

   if (t.IsGenericType && t.GetGenericTypeDefinition().Equals(typeof(Nullable<>))) 
   {
       if (value == null) 
       { 
           return null; 
       }

       t = Nullable.GetUnderlyingType(t);
   }

   return Convert.ChangeType(value, t);
}

Procedure returns error: Cannot cast System.Int32 to System.Int32[]


By : user2969091
Date : March 29 2020, 07:55 AM
should help you out I wrote a procedure that is supposed to return a value from my database. The value to be returned is an integer. Here is my code: , I figure out my error:
code :
  Dim catId = Convert.ToInt32(command.ExecuteScalar())

strange linq to nhibernate issue, Invalid cast from 'System.Int32'


By : I.Tsarev
Date : March 29 2020, 07:55 AM
Does that help I believe the problem is that Linq/NHibernate is trying to map IEntity.Id to a table column instead of TEntity.Id. I had this problem with a LinqToSql repository implementation. The way around it was to use an expression like this:
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