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Having gone through all that, let s take a look at the code that will implement these behaviors. The DeleteChild() and UnDeleteChild() methods deal with marking the child objects as deleted and moving them between the active items in the collection and the DeletedList object: private void DeleteChild(C child) { // mark the object as deleted child.DeleteChild(); // and add it to the deleted collection for storage DeletedList.Add(child); } private void UnDeleteChild(C child) { // we are inserting an _existing_ object so // we need to preserve the object's editleveladded value // because it will be changed by the normal add process int saveLevel = child.EditLevelAdded; Add(child); child.EditLevelAdded = saveLevel; // since the object is no longer deleted, remove it from // the deleted collection DeletedList.Remove(child); } On the surface, this doesn t seem too complicated but look at the code that deals with the child s EditLevelAdded property in the UnDeleteChild() method. Recall the InsertItem() method implemented earlier. That method assumes that any child being added to the collection is a new object, and therefore sets its edit level value to collection s current value. However, the InsertItem() method will be run when this preexisting object is reinserted into the collection, altering its edit level. That would leave the child object with an incorrect edit level value. The problem is that in this case, the child object isn t a new object; it is a preexisting object that is just being restored to the collection. To solve this, the object s edit level value is stored in a temporary field, the child object is re-added to the collection, and then the child object s edit level value is reset to the original value, effectively leaving it unchanged. vb.net code 39 reader VB . NET Image: Example to Read Code 39 Barcode with VB . NET Codes in ...
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NET Code 39 Barcode Reader , Reading Code - 39 barcode images in .NET, C#, VB . NET , ASP.NET applications. Everything has so far laid the groundwork for the n-level undo functionality. All the pieces now exist to make it possible to implement the CopyState(), UndoChanges(), and AcceptChanges() methods, and then the BeginEdit(), CancelEdit() and ApplyEdit() methods. The CopyState() method needs to take a snapshot of the collection s current state. It is invoked when the BeginEdit() method is called on the root object (either the collection itself, or the collection s parent object). At that time, the root object takes a snapshot of its own state and calls CopyState() on any child objects or collections so they can take snapshots of their states as well. void Core.IUndoableObject.CopyState() { CopyState(); } private void CopyState() { // we are going a level deeper in editing _editLevel += 1; CallableStatement cstmt = null; try { // The procedure invoked below has a signature of: // procedure get_emps_with_high_sal( p_deptno in number, // p_sal_limit in number default 2000 , // p_emp_details_cursor out sys_refcursor ) Note that while formulating the CallableStatement string, you should give only two parameter placeholders (there should not be a for the parameter with the default value in the statement string): // formulate a CallableStatement string using SQL92 // syntax String oracleStyle = "begin callable_stmt_demo.get_emps_with_high_sal( , ); end;"; // create the CallableStatement object cstmt = conn.prepareCall( oracleStyle ); // bind the input value by name cstmt.setInt("p_deptno", 10 ); // no need to pass the second parameter "p_sal_limit" // which gets a default value of 2000 // register the output value cstmt.registerOutParameter( "p_emp_details_cursor", OracleTypes.CURSOR ); // execute the query cstmt.execute(); rset = (ResultSet) cstmt.getObject( "p_emp_details_cursor" ); // print the result while (rset.next()) { int empNo = rset.getInt ( 1 ); String empName = rset.getString ( 2 ); String empJob = rset.getString ( 3 ); int empSal = rset.getInt ( 4 ); System.out.println( empNo + " " + empName + " " + empJob + " " + empSal ); } } finally { // release JDBC resources in finally clause. JDBCUtil.close( rset ); JDBCUtil.close( cstmt ); } } The basic principles of conversion between data types in Axapta are as follows: Integers are converted to dates in expressions. Primitive data types are implicitly converted upward. Axapta includes built-in conversion functions for explicit conversion between primitive data types. There is no implicit or explicit conversion between composite data types. Classes are implicitly converted to their superclass or explicitly by casting. Tables are automatically converted to a special table class called common. vb.net code 39 reader Visual Studio . NET Barcode Scanner Library API for . NET Barcode ...
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