Obtaining List of Entities in DataContext
-
11-06-2021 - |
Question
What would be the best way to obtain the list of entities loaded in a given EF 4.1 DbContext? I have been unsuccessful in attemps to locate a collection of DbEntityEntry.Entity
objects loaded for a given context. It seems like it should be possible using a pattern similar to how DbContext.ChangeTracker.Entries()
operates.
Solution
This will give you all entities in the context:
dbContext.ChangeTracker.Entries().Select(e => e.Entity)
but you will get them types as general Object
.
OTHER TIPS
Here is a routine I use is Testing, so I can check values and state of all entries.
public static void ContextDumpTest(DbContext context) {
Debug.WriteLine("====Begin Context Dump========");
var dbsetList = context.ChangeTracker.Entries();
foreach (var dbEntityEntry in dbsetList) {
Debug.WriteLine(dbEntityEntry.Entity.GetType().Name + " => " + dbEntityEntry.State );
switch (dbEntityEntry.State) {
case EntityState.Detached:
case EntityState.Unchanged:
case EntityState.Added:
case EntityState.Modified:
WriteCurrentValues(dbEntityEntry);
break;
case EntityState.Deleted:
WriteSomeValues(dbEntityEntry);
break;
default:
throw new ArgumentOutOfRangeException();
}
Debug.WriteLine("==========End of Entity======");
}
Debug.WriteLine("==========End of Context======");
}
private static void WriteCurrentValues(DbEntityEntry dbEntityEntry) {
foreach (var cv in dbEntityEntry.CurrentValues.PropertyNames) {
Debug.WriteLine(cv + "=" + dbEntityEntry.CurrentValues[cv]);
}
}
private static void WriteSomeValues(DbEntityEntry dbEntityEntry)
{
foreach (var cv in dbEntityEntry.OriginalValues.PropertyNames)
{
Debug.WriteLine(cv + "=" + dbEntityEntry.OriginalValues[cv]);
}
}
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