EF 4.1 Code First: "non-null value of type 'DateTime'" Issue

33,055

Solution 1

Is this telling me that all rows in the date must have a date and not be null? What do I do if I dont want to set a date on specific row?

It looks like the DB you point at have null values for Date1. If you do indeed not want to set a date for all rows, just make your Date1 property nullable:

public DateTime? Date1{get;set;}

Alternatively you can just put in a default date for all the rows that do not have a datetime set currently via SQL.

Solution 2

public DateTime? Date1 { get; set; }

use this, your model needs to be told that there can be null values inside your database, otherwise it will assume there isn't.

Solution 3

Use this :

public Nullable<DateTime> LoginDate { get; set; }

33,055

Paul Brown

Updated on July 09, 2022

Comments

Paul Brown almost 2 years

After initial dev and testing I have now pointed my MVC3 application at an existing database which contains live data.

However I am getting this error related to the field called Date1 of type "datetime".

The 'Date1' property on 'StaffAttachment' could not be set to a 'null' value. You must set this property to a non-null value of type 'DateTime'.

Is this telling me that all rows in the date must have a date and not be null? What do I do if I dont want to set a date on specific row?

Can anyone offer advice on resolving this issue?

Thanks Paul

EDIT 1 (Posting Model)

public class StaffAttachment
{
    [Key]
    public int AttachmentID { get; set; }

    public int? StaffID { get; set; }

    public int? TypeID { get; set; }

    [Required]
    [DisplayName("Proof of ID")]
    public int? AttachmentTypeID { get; set; }

    [Required]
    [DisplayName("ID Reference")]
    public string Reference1 { get; set; }

    public string Reference2 { get; set; }

    public string DateType { get; set; }

    [DisplayName("Expiry Date")]
    public DateTime Date1 { get; set; }

    [Required]
    public DateTime Date2 { get; set; }

    public DateTime Date3 { get; set; }

    public DateTime Date4 { get; set; }

    public string AttachmentPath { get; set; }

    public int? ValidatedUserID { get; set; }

    public DateTime ValidatedDate { get; set; }

    public int? CreatedUserID { get; set; }

    public DateTime CreatedDate { get; set; }

    public int? EditedUserID { get; set; }

    public DateTime EditedDate { get; set; }

    public TimeSpan TimeStamp { get; set; }

    public string FileName { get; set; }

    public byte[] FileImage { get; set; }

    public int AttachmentSection { get; set; }
}

Paul Brown about 13 years

When i have "DateTime?", I get build error: "Cannot implicitly convert type 'System.DateTime?' to 'System.DateTime'. An explicit conversion exists (are you missing a cast?)"
StriplingWarrior about 13 years

@Paul Brown: Then cast it: Date1 = (DateTime?)item.Date1
Paul Brown about 13 years

where, in my model? sorry i am a newbie!
Paul Brown about 13 years

On this line "public DateTime? Date1{get;set;}"
Er Mayank almost 10 years

could anyone please convert this to VB.net code.. I have tried Public Property Date1() As Date?
Er Mayank almost 10 years

could anyone please convert this to VB.net code.. I have tried Public Property Date1() As Date?
radkan about 7 years

This solved my problem! It actually solved another issue I was having but I looked and looked through various posts and none of the suggestions worked. Thanks.
Sushil Jadhav over 5 years

How this answer is diff from above one posted by @BrokenGlass ?
Lewis over 5 years

Let's go back to the land of time in 2011 and 2012 to tell you that there is no difference, he never accepted an answer; therefore it was an open question - meaning I answered it without reading @BrokenGlass answer from the year before. Ode to be young and naive again.
Ustin over 4 years

Sorry, but both Nullable<DateTime> and DateTime? don't work. Are there any other solutions ?