Change tracking in entity framework

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Hi Everyone,
I have a problem in Change Tracking in entity framework in modified sate
I have used such as this code

C#

var modifiedEntities = ChangeTracker.Entries()
    .Where(p => p.State == EntityState.Modified).ToList();

var now = DateTime.UtcNow;

foreach (var change in modifiedEntities)
{
    var entityName = change.Entity.GetType().Name;
    foreach (var prop in change.OriginalValues.PropertyNames)
    {
        var originalValue = change.OriginalValues[prop].ToString();
        var currentValue = change.CurrentValues[prop].ToString();
        if (originalValue != currentValue) //Only create a log if the value changes
        {
            //Create the Change Log
        }
    }

The debugger comes into if condition but my problem is the field has been modified but this code could not find it but it knows it has modified. Because it comes into the inner part. How can I get the previous value..
Thanks

What I have tried:

I implemented its code but it could get the previous value.

Posted 29-Sep-20 20:22pm

Moses_k

Updated 29-Sep-20 22:12pm

Richard Deeming

v2

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard Deeming · Accepted Answer · 2020-09-29T22:13:00

Try:

C#

var modifiedEntities = ChangeTracker.Entities().Where(p => p.State == EntityState.Modified).ToList();
foreach (var change in modifiedEntities)
{
    var entityName = change.Entity.GetType().Name;
    foreach (string propertyName in change.OriginalValues.PropertyNames)
    {
        if (change.Property(propertyName) is DbPropertyEntry property && property.IsModified)
        {
            object originalValue = property.OriginalValue;
            object currentValue = proeprty.CurrentValue;
            // Create the change log...
        }
    }
}

Change tracking in entity framework

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Change tracking in entity framework

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