/// <summary>
/// Creates a delegate to clone the specified
/// </summary>
/// <returns>Function to clone this data record</returns>
private static Func <TRecord, TRecord> CreateCloneDelegate()
{
// --- Create a dynamic method
var cloneMethod = new DynamicMethod("CloneFactory" + s_CloneMethods.Count,
typeof(TRecord),
new[] { typeof(TRecord) },
true);
var il = cloneMethod.GetILGenerator();
var metadata = RecordMetadataManager.GetMetadata <TRecord>();
var cloneObject = il.DeclareLocal(typeof(TRecord));
// --- Create an empty clone of TRecord and store it
il.Emit(OpCodes.Newobj, typeof(TRecord).GetConstructor(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic,
null, Type.EmptyTypes, null));
il.Emit(OpCodes.Stloc, cloneObject);
// --- Copy each property value
foreach (var dataColumn in metadata.DataColumns)
{
il.Emit(OpCodes.Ldloc, cloneObject); // cloneObject
il.Emit(OpCodes.Ldarg_0); // cloneObject, origObject
il.Emit(OpCodes.Call, dataColumn.PropertyInfo.GetGetMethod()); // cloneObject, origObject.dataColumn.Value
il.Emit(OpCodes.Call, dataColumn.PropertyInfo.GetSetMethod());
}
il.Emit(OpCodes.Ldloc, cloneObject);
il.Emit(OpCodes.Ret);
// --- Create the delegate
var cloneDelegate = cloneMethod.CreateDelegate(Expression.GetFuncType(typeof(TRecord), typeof(TRecord)));
return((Func <TRecord, TRecord>)cloneDelegate);
}
/// <summary>
/// Touches all data fields as if those had been modified.
/// </summary>
public void TouchAllFields()
{
// --- Let's assume this record has already been loaded
_isLoaded = true;
var metadata = RecordMetadataManager.GetMetadata <TRecord>();
foreach (var dataColumn in metadata.DataColumns)
{
if (!dataColumn.IsAutoGenerated)
{
_modifiedColumns.Add(dataColumn.ColumnName);
}
}
}
/// <summary>
/// Merges the changed properties from another object
/// </summary>
/// <param name="other">Other data record object</param>
public void MergeChangesFrom(TRecord other)
{
// --- Let's assume this record has already been loaded
_isLoaded = true;
var metadata = RecordMetadataManager.GetMetadata <TRecord>();
foreach (var dataColumn in metadata.DataColumns)
{
var propInfo = typeof(TRecord).GetProperty(dataColumn.Name);
var oldVal = propInfo.GetValue(this);
var newVal = propInfo.GetValue(other);
if (oldVal == null && newVal != null || oldVal != null && !oldVal.Equals(newVal))
{
propInfo.SetValue(this, newVal);
}
}
}
