liveexperienceupdate.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;
using System.IO;

public partial class Back_LiveExperienceUpdate : System.Web.UI.Page
{
    private string listUrl = "LiveExperienceList.aspx";
    private string categoryModule = "LiveExperience";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string title = Request["Title"];
            if (!string.IsNullOrEmpty(title))
            {
                BindCategory();
                BindData(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 BindData(string title)
    {
        IObjectContainer db = DB4OHelper.DB;
        try
        {
            LiveExperience2 item = new LiveExperience2(db);
            LiveExperience2 target = (LiveExperience2)item.GetOne(title);
            txtTitle.Text = target.Title;
            txtContent.Text = target.Content;
            ddlCategory.SelectedValue = target.Category;
            Calendar1.Text = target.CreateTime.ToString();
            txtHit.Text = target.Hit.ToString();
            txtUrl.Text = target.Url;

            string imageUrl = Tools.GetPicturePath() + target.Picture;
            Image1.ImageUrl = imageUrl;
            ViewState["Image"] = target.Picture;
           

        }
        catch
        {
        }
        finally
        {
            db.Close();
        }
    }
    protected void btnSave_Click(object sender, EventArgs e)
    {
        if (Valid())
        {
            IObjectContainer db = DB4OHelper.DB;
            try
            {
               //LiveExperience item = new LiveExperience(db);
                LiveExperience2 target = new LiveExperience2(db);
                 target = (LiveExperience2)target.GetOne(ViewState["Title"].ToString());
                 target.Db = db;
             
                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.Url = txtUrl.Text.Trim();
                
                if (FileUpload1.HasFile)
                {
                    string picture = Tools.GetPictureName() + Path.GetExtension(FileUpload1.PostedFile.FileName);
                    target.Picture = picture;
                    string path = Tools.GetPictureSavePath() + picture;

                    FileUpload1.SaveAs(path);
                }
                else
                {
                    target.Picture = ViewState["Image"].ToString();
                }
                //item.Update(target);
                target.Update();
                Message.Show("Update Success!");

            }
            catch(Exception ex)
            {
                Response.Write(ex.Message);
                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;
    }
}