The 'x' property on 'y' could not be set to a 'System.Decimal' value. You must set this property to a non-null value of type 'System.Boolean'

Question

I have a MySQL stored procedure selecting data from specific table named tuser .

I'm using EntityFramework6, so I defined the result of procedure as an entity of tuser .

When I use the procedure in C# code, the following exception is thrown:

The 'bIsActive' property on 'tuser' could not be set to a 'System.Decimal' value. You must set this property to a non-null value of type 'System.Boolean'.

I cannot understand connection between the action I want to do and exception thrown.

Table definition in Database:

CREATE TABLE `tuser` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`sUserName` varchar(45) DEFAULT NULL,
`sUserNameMail` varchar(45) DEFAULT NULL,
`sMail` varchar(45) DEFAULT NULL,
`bIsActive` bit(1) DEFAULT b'1')
 ENGINE=InnoDB AUTO_INCREMENT=2225 DEFAULT CHARSET=utf8;

bIsActive definition in ef:

store procedure definition:

CREATE DEFINER=``@`` PROCEDURE `GetActiveUsers`()
BEGIN
  select u.* from tuser u
  where u.bIsActive=true;
END

error occures when executing following code line:

List<tuser> list = Context.GetActiveUsers().ToList();

inner GetActiveUsers code (auto generated):

public virtual ObjectResult<tuser> GetActiveUsers()
{    
   return ((IObjectContextAdapter)this).ObjectContext.ExecuteFunction<tuser>("GetActiveUsers");
}

Answer 1

Ok, Thanks to all the responders.

I still don't know what was the problem, but when I removed tuser table from model and added it again, problem has been solved.

Answer 2

The exception tells us that the boolean variable bIsActive is being assigned a decimal or not being cast properly somewhere around the following line:

List<tuser> list = Context.GetActiveUsers().ToList();

The solution is therefore a journey from the point the exception is thrown, to the point where the value has been misassigned.

To begin with, try changing...

public virtual ObjectResult<tuser> GetActiveUsers()
{    
    return ((IObjectContextAdapter)this).ObjectContext.ExecuteFunction<tuser>("GetActiveUsers");
}

...with...

public virtual ObjectResult<tuser> GetActiveUsers()
{
    try
    {
        Stringbuilder sb = new Stringbuilder();

        IObjectContextAdapter a = ((IObjectContextAdapter)this); // Breakpoint this line and F11 step through the code, looking at local variables as you go

        sb.AppendLine(", a: " + a.ToString());

        var b = a.ObjectContext;

        sb.AppendLine(", b: " + b.ToString());

        var c = b.ExecuteFunction<tuser>("GetActiveUsers");

        sb.AppendLine(", c: " + c.ToString());

        MessageBox.Show("No exception: (" + sb.ToString() + ")");

        return c;

    }
    catch(Exception ex)
    {
        MessageBox.Show("Exception: (" + ex.message + ex.stacktrace + ")");

    }

}

I hope you can see what I'm trying to do there ie split up the code into bite-sized chunks and study the output of each one. The message box message tells you if an exception was thrown or not, and will give a StackTrace , which is very helpful on a journey like this.

• Replace the method
• Run the program
• Paste a screenshot of the MessageBox into your post

The next step will probably be to take a look at the database function, GetActiveUsers .

How do you manage your MySql database? Do you use MySql workbench or another interface? You should be able to view the function from there.