방법: 전송 충돌 검색 및 해결
LINQ to SQL에서는 여러 사용자에 의한 데이터베이스 변경으로 발생하는 충돌을 검색하고 해결하는 많은 리소스를 제공합니다. 자세한 내용은 방법: 변경 충돌 관리를 참조하세요.
예시
다음 예제에서는 ChangeConflictException 예외를 catch하는 try
/catch
블록을 보여 줍니다. 각 충돌의 엔터티 및 멤버 정보는 콘솔 창에 표시됩니다.
참고 항목
정보 검색을 지원하려면 using System.Reflection
지시문(Visual Basic의 Imports System.Reflection
)을 포함해야 합니다. 자세한 내용은 System.Reflection를 참조하세요.
// using System.Reflection;
Northwnd db = new Northwnd(@"c:\northwnd.mdf");
Customer newCust = new Customer();
newCust.City = "Auburn";
newCust.CustomerID = "AUBUR";
newCust.CompanyName = "AubCo";
db.Customers.InsertOnSubmit(newCust);
try
{
db.SubmitChanges(ConflictMode.ContinueOnConflict);
}
catch (ChangeConflictException e)
{
Console.WriteLine("Optimistic concurrency error.");
Console.WriteLine(e.Message);
Console.ReadLine();
foreach (ObjectChangeConflict occ in db.ChangeConflicts)
{
MetaTable metatable = db.Mapping.GetTable(occ.Object.GetType());
Customer entityInConflict = (Customer)occ.Object;
Console.WriteLine("Table name: {0}", metatable.TableName);
Console.Write("Customer ID: ");
Console.WriteLine(entityInConflict.CustomerID);
foreach (MemberChangeConflict mcc in occ.MemberConflicts)
{
object currVal = mcc.CurrentValue;
object origVal = mcc.OriginalValue;
object databaseVal = mcc.DatabaseValue;
MemberInfo mi = mcc.Member;
Console.WriteLine("Member: {0}", mi.Name);
Console.WriteLine("current value: {0}", currVal);
Console.WriteLine("original value: {0}", origVal);
Console.WriteLine("database value: {0}", databaseVal);
}
}
}
catch (Exception ee)
{
// Catch other exceptions.
Console.WriteLine(ee.Message);
}
finally
{
Console.WriteLine("TryCatch block has finished.");
}
' Imports System.Reflection
Dim newCust As New Customer()
newCust.City = "Auburn"
newCust.CustomerID = "AUBUR"
newCust.CompanyName = "AubCo"
db.Customers.InsertOnSubmit(newCust)
Try
db.SubmitChanges(ConflictMode.ContinueOnConflict)
Catch e As ChangeConflictException
Console.WriteLine("Optimistic concurrency error.")
Console.WriteLine(e.Message)
Console.ReadLine()
For Each occ In db.ChangeConflicts
Dim metatable As MetaTable = db.Mapping.GetTable(occ.Object.GetType())
Dim entityInConflict = CType(occ.Object, Customer)
Console.WriteLine("Table name: {0}", metatable.TableName)
Console.Write("Customer ID: ")
Console.WriteLine(entityInConflict.CustomerID)
For Each mcc In occ.MemberConflicts
Dim currVal = mcc.CurrentValue
Dim origVal = mcc.OriginalValue
Dim databaseVal = mcc.DatabaseValue
Dim mi = mcc.Member
Console.WriteLine("Member: {0}", mi.Name)
Console.WriteLine("current value: {0}", currVal)
Console.WriteLine("original value: {0}", origVal)
Console.WriteLine("database value: {0}", databaseVal)
Next
Next
Catch ee As Exception
' Catch other exceptions.
Console.WriteLine(ee.Message)
Finally
Console.WriteLine("TryCatch block has finished.")
End Try