private void button1_Click(object sender, EventArgs e)
{
listBox1.Items.Clear();
//EntityState.Added
foreach (var entry in context.ObjectStateManager
.GetObjectStateEntries(EntityState.Added))
{
string NewEmplNo, NewEmplName;
NewEmplNo = ((Transfer)(entry.Entity)).TransferID;
NewEmplName = ((Transfer)(entry.Entity)).Description;
listBox1.Items.Add(String.Format(
"員工代碼{0}為Added，目前的員工名稱：{1} ",
NewEmplNo, NewEmplName));
}
//EntityState.Modified
foreach (var entry in context.ObjectStateManager
.GetObjectStateEntries(EntityState.Modified))
{
string NewEmplName, OldEmplName, OrginalEmplNo;
//取得員工名稱目前值
CurrentValueRecord curr = entry.CurrentValues;
NewEmplName = (string)(curr.GetValue(curr.GetOrdinal("Description")));
//取得員工名稱原來值
OriginalValueRecord org = entry.GetUpdatableOriginalValues();
OldEmplName = (string)(org.GetValue(org.GetOrdinal("Description")));
OrginalEmplNo = ((Transfer)(entry.Entity)).TransferID;
listBox1.Items.Add(String.Format("員工代碼{0}為Modified， " +
"目前的員工名稱：{1}，原來的員工名稱：{2} ",
OrginalEmplNo, NewEmplName, OldEmplName));
}
//EntityState.Deleted
foreach (var entry in context.ObjectStateManager
.GetObjectStateEntries(EntityState.Deleted))
{
string OldEmplNo, OldEmplName;
OldEmplNo = ((Transfer)(entry.Entity)).TransferID;
OldEmplName = ((Transfer)(entry.Entity)).Description;
listBox1.Items.Add(String.Format("員工代碼{0}為Deleted， " +
"原來的員工名稱：{1} ", OldEmplNo, OldEmplName));
}
//EntityState.Unchanged
foreach (var entry in context.ObjectStateManager
.GetObjectStateEntries(EntityState.Unchanged))
{
string currEmplNo, currEmplName;
currEmplNo = ((Transfer)(entry.Entity)).TransferID;
currEmplName = ((Transfer)(entry.Entity)).Description;
listBox1.Items.Add(String.Format("員工代碼{0}為Unchanged， " +
"目前的員工名稱：{1} ", currEmplNo, currEmplName));
}
}
private static void PopulateComplexType(OriginalValueRecord originalValues, string propertyName,
object originalValue, ComplexType complexType)
{
var ordinal = originalValues.GetOrdinal(propertyName);
originalValues = (OriginalValueRecord)originalValues.GetValue(ordinal);
foreach (var cp in complexType.Properties)
{
var value = Server.Helper.GetMemberValue(originalValue, cp.Name);
if (cp.TypeUsage.EdmType is ComplexType loopComplexType)
{
PopulateComplexType(originalValues, cp.Name, value, loopComplexType);
}
else
{
var loopOrdinal = originalValues.GetOrdinal(cp.Name);
originalValues.SetValue(loopOrdinal, value);
}
}
}
void IDataServiceUpdateProvider.SetConcurrencyValues(object resourceCookie, bool?checkForEquality, IEnumerable <KeyValuePair <string, object> > concurrencyValues)
{
if (checkForEquality == null)
{
throw new DataServiceException(500, "Cannot perform operation without ETag.");
}
if (!checkForEquality.Value)
{
throw new DataServiceException(500, "IfNoneMatch header not supported in update and delete.");
}
ObjectStateEntry objectStateEntry = CurrentDataSource.ObjectContext.ObjectStateManager.GetObjectStateEntry(resourceCookie);
OriginalValueRecord originalValues = objectStateEntry.GetUpdatableOriginalValues();
foreach (KeyValuePair <string, object> etag in concurrencyValues)
{
int propertyOrdinal = originalValues.GetOrdinal(etag.Key);
originalValues.SetValue(propertyOrdinal, etag.Value);
}
}
