CODEWITHSUNDEEP
c#nullable
RG-3
RG-3

Reputation: 6188

Nullable<int> To Int Error

I am getting this

Nullable object must have a value.

error in this line:

   results.Test= installment.Test1.Value;

My 'Test' property looks like this:

 [DataMember]
 public int Test{ get; set; }

And my 'Test1' property looks like this in LINQ2SQL Designer:

public System.Nullable<int> Test1
    {
        get
        {
            return this._Test1;
        }
        set
        {
            if ((this._test1!= value))
            {
                this.OnTest1Changing(value);
                this.SendPropertyChanging();
                this._Test1= value;
                this.SendPropertyChanged("Test1");
                this.OnTest1Changed();
            }
        }
    }

What am I doing wrong here?

Upvotes: 2

Views: 274

Answers (8)

Henk Holterman
Henk Holterman

Reputation: 273244

Your Test1 property is (still) null. The underlying field _Test1 will default to null.
You can use

results.Test = installment.Test1 ?? 0;

if 0 is an acceptable default value.

Upvotes: 3

Damon
Damon

Reputation: 109

If you are going to use the value property it needs to have a value that is not null. You can check to see if the property has a value by using the HasValue property. 

var test = (Test1.HasValue) ? (int?)Test1.Value : null;

You can use the variable directly and not use Value property.

var testing = Test1;

Upvotes: 0

Mark Menchavez
Mark Menchavez

Reputation: 1661

try this.

if (installment.Test1.HasValue) results.Test= installment.Test1.Value;

Upvotes: 0

James Johnson
James Johnson

Reputation: 46047

Try using this instead:

results.Test = installment.Test1.GetValueOrDefault(-1); //set default value

Upvotes: 1

lbergnehr
lbergnehr

Reputation: 1598

Test1.Value will throw if Test1.HasValue returns false.

Upvotes: 0

Bala R
Bala R

Reputation: 108957

Looks like installment.Test1.Value is null and cannot be assigned to int

Try

results.Test= installment.Test1 ?? 0;

Upvotes: 0

Tigran
Tigran

Reputation: 62246

The Value of installment.Test1.Value is a null and you try to assign it to non nullable integer type property Test.

Upvotes: 0

dlev
dlev

Reputation: 48596

installment.Test1.Value; Assumes that installment.Test1 actually has a value. The error you're getting, though, means that it doesn't, and that the property is actually null. Is that unexpected?

Upvotes: 0

Related Questions