introductionupdate.aspx.cs

一个简单的Demo

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using Surance.DB4ODAL;
using Surance.DBUtility;
using Db4objects.Db4o;
using Surance.Utility;

public partial class IntroductionList : System.Web.UI.Page
{
    private string listUrl = "IntroductionList.aspx";
    private string categoryModule = "Introduction";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string title = Request["Title"];
            if (!string.IsNullOrEmpty(title))
            {
                BindCategory();
                BindDate(title.Trim());
                ViewState["Title"] = title.Trim();
            }
        }
    }
    protected void btnList_Click(object sender, EventArgs e)
    {
        Response.Redirect(listUrl);
    }

    private void BindCategory()
    {
        IObjectContainer db = DB4OHelper.DB;
        try
        {
            Category c = new Category(db);
            ddlCategory.DataSource = c.GetByModule(categoryModule);
            ddlCategory.DataBind();
        }
        catch
        {

        }
        finally
        {
            db.Close();
        }
    }

    private void BindDate(string title)
    {
        IObjectContainer db = DB4OHelper.DB;
        try
        {
            Introduction intro = new Introduction(db);
            Introduction target = intro.GetOne(title);
            txtTitle.Text = target.Title;
            txtContent.Text = target.Content;
            ddlCategory.SelectedValue = target.Category;
            Calendar1.Text = target.CreateTime.ToString();
            txtHit.Text = target.Hit.ToString();
        }
        catch
        {
        }
        finally
        {
            db.Close();
        }
    }
    protected void btnSave_Click(object sender, EventArgs e)
    {
        if (Valid())
        {
            IObjectContainer db = DB4OHelper.DB;
            try
            {
                Introduction intro = new Introduction(db);
                Introduction target = intro.GetOne(ViewState["Title"].ToString());
                target.Title = txtTitle.Text.Trim();
                target.Category = ddlCategory.SelectedValue.Trim();
                target.Content = txtContent.Text.Trim();
                target.Hit = Convert.ToInt32(txtHit.Text.Trim());
                target.CreateTime = Convert.ToDateTime(Calendar1.Text.Trim());
                //target.
                intro.Update(target);
                Message.Show("Update Success!");

            }
            catch
            {
                Message.Show("Update Fail!");
            }
            finally
            {
                db.Close();
            }
        }
    }

    private bool Valid()
    {
        bool result = true;
        if (result)
        {
            if (string.IsNullOrEmpty(txtTitle.Text.Trim()))
            {
                result = false;
                Message.Show("Title is not empty!");
            }
            else
            {
                result = true;
            }
        }

        if (result)
        {
            if (string.IsNullOrEmpty(txtHit.Text.Trim()))
            {
                result = false;
                Message.Show("Hit is not empty!");
            }
            else
            {
                result = true;
            }
        }

        if (result)
        {
            try
            {
                Convert.ToInt32(txtHit.Text.Trim());
                result = true;
            }
            catch
            {
                Message.Show("Hit format not right!");
                result = false;
            }
        }

        if (result)
        {
            if (string.IsNullOrEmpty(Calendar1.Text.Trim()))
            {
                result = false;
                Message.Show("CreateTime is not empty!");
            }
            else
            {
                result = true;
            }
        }

        if (result)
        {
            try
            {
                Convert.ToDateTime(Calendar1.Text.Trim());
                result = true;
            }
            catch
            {
                Message.Show("CreateTime format not right!");
                result = false;
            }
        }

        if (result)
        {
            if (string.IsNullOrEmpty(txtContent.Text.Trim()))
            {
                result = false;
                Message.Show("Content is not empty!");
            }
            else
            {
                result = true;
            }
        }
        return result;
    }
}