в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:15:03Z

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==Bind ArrayList to ListBox==

<source lang="csharp">using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;
public class Employee{
public string ID;
public string Name ;
public Employee(string strName, string strID)
{
this.ID = strID;
this.Name = strName;
}
public override string ToString()
{
return this.ID + " : " + this.Name;
}
}
public class ListBoxBindArrayList : System.Windows.Forms.Form
{
private System.Windows.Forms.GroupBox groupBox1;
private System.Windows.Forms.RadioButton rbAuthors;
private System.Windows.Forms.RadioButton rbEmployees;
private System.Windows.Forms.ListBox lb;
private DataTable dataTable;
private ArrayList Employees = new ArrayList();
private System.ruponentModel.Container components = null;
public ListBoxBindArrayList()
{
InitializeComponent();
lb.Items.Add("A");
lb.Items.Add("B");
lb.Items.Add("C");
lb.Items.Add("D");
lb.Items.Add("E");
lb.SelectedIndex = 0;
// populate the arraylist for later use.
Employees.Add(new Employee("A", "1"));
Employees.Add(new Employee("B", "2"));
Employees.Add(new Employee("C", "3"));
Employees.Add(new Employee("D", "4"));
Employees.Add(new Employee("E", "5"));
Employees.Add(new Employee("F", "6"));
Employees.Add(new Employee("G", "7"));
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
private void InitializeComponent()
{
this.lb = new System.Windows.Forms.ListBox();
this.groupBox1 = new System.Windows.Forms.GroupBox();
this.rbEmployees = new System.Windows.Forms.RadioButton();
this.rbAuthors = new System.Windows.Forms.RadioButton();
this.groupBox1.SuspendLayout();
this.SuspendLayout();
//
// lb
//
this.lb.Location = new System.Drawing.Point(16, 8);
this.lb.Name = "lb";
this.lb.Size = new System.Drawing.Size(232, 212);
this.lb.TabIndex = 0;
this.lb.DisplayMemberChanged += new System.EventHandler(this.lb_DisplayMemberChanged);
this.lb.ValueMemberChanged += new System.EventHandler(this.lb_ValueMemberChanged);
this.lb.DataSourceChanged += new System.EventHandler(this.lb_DataSourceChanged);
this.lb.SelectedValueChanged += new System.EventHandler(this.lb_SelectedValueChanged);
this.lb.SelectedIndexChanged += new System.EventHandler(this.lb_SelectedIndexChanged);
//
// groupBox1
//
this.groupBox1.Controls.AddRange(new System.Windows.Forms.Control[] {
this.rbEmployees,
this.rbAuthors});
this.groupBox1.Location = new System.Drawing.Point(16, 240);
this.groupBox1.Name = "groupBox1";
this.groupBox1.TabIndex = 1;
this.groupBox1.TabStop = false;
this.groupBox1.Text = "DataSource";
//
// rbEmployees
//
this.rbEmployees.Location = new System.Drawing.Point(24, 56);
this.rbEmployees.Name = "rbEmployees";
this.rbEmployees.TabIndex = 1;
this.rbEmployees.Text = "Employee\"s";
this.rbEmployees.CheckedChanged += new System.EventHandler(this.rb_CheckedChanged);
//
// rbAuthors
//
this.rbAuthors.Checked = true;
this.rbAuthors.Location = new System.Drawing.Point(24, 32);
this.rbAuthors.Name = "rbAuthors";
this.rbAuthors.TabIndex = 0;
this.rbAuthors.TabStop = true;
this.rbAuthors.Text = "Authors";
this.rbAuthors.CheckedChanged += new System.EventHandler(this.rb_CheckedChanged);
//
// ListBoxBindArrayList
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(264, 389);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.groupBox1,
this.lb});
this.Name = "ListBoxBindArrayList";
this.Text = "ListBoxBindArrayList";
this.Load += new System.EventHandler(this.ListBoxBindArrayList_Load);
this.groupBox1.ResumeLayout(false);
this.ResumeLayout(false);
}
[STAThread]
static void Main()
{
Application.Run(new ListBoxBindArrayList());
}
private void rb_CheckedChanged(object sender, System.EventArgs e)
{
lb.DataSource = Employees;
lb.DisplayMember = "Name";
lb.ValueMember = "ID";
}
private void lb_SelectedIndexChanged(object sender, System.EventArgs e)
{
MessageBox.Show(lb.SelectedIndex.ToString()+ "\n" + lb.GetItemText(lb.SelectedItem),"lb_SelectedIndexChanged");
}
private void lb_SelectedValueChanged(object sender, System.EventArgs e)
{
MessageBox.Show(lb.GetItemText(lb.SelectedItem),"lb_SelectedValueChanged");
}
private void lb_DataSourceChanged(object sender, System.EventArgs e)
{
MessageBox.Show(lb.DataSource.ToString(), "lb_DataSourceChanged");
}
private void lb_DisplayMemberChanged(object sender, System.EventArgs e)
{
MessageBox.Show(lb.DisplayMember.ToString(), "lb_DisplayMemberChanged");
}
private void lb_ValueMemberChanged(object sender, System.EventArgs e)
{
MessageBox.Show(lb.ValueMember.ToString(), "lb_ValueMemberChanged");
}
private void ListBoxBindArrayList_Load(object sender, System.EventArgs e)
{
this.lb.SelectedValueChanged += new System.EventHandler(this.lb_SelectedValueChanged);
this.lb.SelectedIndexChanged += new System.EventHandler(this.lb_SelectedIndexChanged);
}
}</source>

==Master detail view==

<source lang="csharp">using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;
public class MasterDetail : System.Windows.Forms.Form
{
public MasterDetail()
{
this.lstCategories = new System.Windows.Forms.ListBox();
this.lstProducts = new System.Windows.Forms.ListBox();
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
this.lstCategories.Location = new System.Drawing.Point(8, 28);
this.lstCategories.Size = new System.Drawing.Size(140, 225);
this.lstCategories.TabIndex = 0;
this.lstCategories.SelectedIndexChanged += new System.EventHandler(this.lstCategories_SelectedIndexChanged);
//
this.lstProducts.Location = new System.Drawing.Point(152, 28);
this.lstProducts.Size = new System.Drawing.Size(252, 225);
this.lstProducts.TabIndex = 1;
//
this.label1.Location = new System.Drawing.Point(8, 8);
this.label1.Size = new System.Drawing.Size(108, 16);
this.label1.TabIndex = 2;
this.label1.Text = "Category:";
//
this.label2.Location = new System.Drawing.Point(152, 8);
this.label2.Size = new System.Drawing.Size(108, 16);
this.label2.TabIndex = 3;
this.label2.Text = "Products:";
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
this.ClientSize = new System.Drawing.Size(412, 266);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.label2,
this.label1,
this.lstProducts,
this.lstCategories});
this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.Text = "A Master-Detail Form";
this.Load += new System.EventHandler(this.MasterDetail_Load);
this.ResumeLayout(false);
}
string connectionString = "Data Source=localhost;Initial Catalog=Northwind;Integrated Security=SSPI";
string categorySQL = "SELECT * FROM Categories";
string productSQL = "SELECT * FROM Products";
DataSet ds = new DataSet();
DataRelation relation;
private System.Windows.Forms.ListBox lstCategories;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.ListBox lstProducts;
public static void Main()
{
Application.Run(new MasterDetail());
}
private void MasterDetail_Load(object sender, System.EventArgs e)
{
SqlConnection con = new SqlConnection(connectionString);
SqlCommand com = new SqlCommand(categorySQL, con);
SqlDataAdapter adapter = new SqlDataAdapter(com);

con.Open();
adapter.Fill(ds, "Categories");
adapter.SelectCommand.rumandText = productSQL;
adapter.Fill(ds, "Products");
con.Close();
DataColumn parentCol = ds.Tables["Categories"].Columns["CategoryID"];
DataColumn childCol = ds.Tables["Products"].Columns["CategoryID"];
relation = new DataRelation("Cat_Prod", parentCol, childCol);
ds.Relations.Add(relation);
foreach (DataRow row in ds.Tables["Categories"].Rows)
{
lstCategories.Items.Add(row["CategoryName"]);
}
}
private void lstCategories_SelectedIndexChanged(object sender, System.EventArgs e)
{
lstProducts.Items.Clear();
DataRow[] rows = ds.Tables["Categories"].Select("CategoryName="" + lstCategories.Text + """);
DataRow parent = rows[0];
foreach (DataRow child in parent.GetChildRows(relation))
{
lstProducts.Items.Add(child["ProductName"]);
}
}
}</source>

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Csharp/CSharp Tutorial/GUI Windows Forms/DataBinding ListBox - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия