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  • [转]datapager分页问题(点击两次)

    今天看了一下ListView和DataPager配合做数据分页的教程,感觉很爽很方便,用在自己的项目上面时却出现了问题,具体表现在点击上一页、下一页或者数字跳转页面时通常要点两下才能有反应,而且有时候乱跳页。 

    我开始测试的代码是这样的:

      
    public partial class ListViewTest : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
                BindData();
        }
        
        protected void BindData()
        {
            DBDataContext db = new DBDataContext();
            var ds = db.Category;
            ListView1.DataSource = ds;
            ListView1.DataBind();
            db.Dispose();
        }
    }

    出现如开始提及的问题,找了半天原因也没有找到。后来在国外的一个论坛上找到了同病相怜的人,有专家给出了一个解决方案。把Page_Load里的数据绑定移到Page_PreRender中,也就是:

    public partial class ListViewTest : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            //if (!Page.IsPostBack)
            //    BindData();
        }
    
        protected void Page_PreRender(object sender, EventArgs e)
        {
            BindData();
        }
        
        protected void BindData()
        {
            DBDataContext db = new DBDataContext();
            var ds = db.Category;
            ListView1.DataSource = ds;
            ListView1.DataBind();
            db.Dispose();
        }
    }

    试了一下分页果然正常了。难道是Page_Load来的太迟?不得而知。另外,还有一种方法同样可行:

    public partial class ListViewTest : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
                BindData();
        }
    
        protected void Page_PreRender(object sender, EventArgs e)
        {
            //BindData();
        }
    
        protected void ListView1_PagePropertiesChanging(object sender, PagePropertiesChangingEventArgs e)
        {
            DataPager1.SetPageProperties(e.StartRowIndex, e.MaximumRows, false);
            BindData();
        }
    
        protected void BindData()
        {
            DBDataContext db = new DBDataContext();
            var ds = db.Category;
            ListView1.DataSource = ds;
            ListView1.DataBind();
            db.Dispose();
        }
    }
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  • 原文地址:https://www.cnblogs.com/chen54/p/2738851.html
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