C# Web中Session的使用

1. 关于使用之前要注意的：

　在使用session之前，一定要注意继承自System.Web.UI.Page，或在使用session时加上System.Web.HttpContext.Current:

如：System.Web.HttpContext.Current.Session["Items"] ="xxx";

2. 在使用过程中遇到数据类型的转换，具体操作如下：

将Session中的值转为DataTable类型：

　 System.Data.DataTable dtTrendResult = (System.Data.DataTable)System.Web.HttpContext.Current.Session["xxx"];

3. Web中Session的设置与获取：

public List<DevicesModel> GetDeviceDataList(string OrderID)

{

    List<DevicesModel> dms = new List<DevicesModel>();

    if (Session["DeviceList"] == null)

    {

        DevicesModel dm1 = new DevicesModel();

        dm1.ID = ;

        dm1.OrderID = "ORD0001";

        dm1.DeviceType = "DTM";

        dm1.Manufacturer = "CETE";

        dm1.Model = "MC-202";

        dm1.SerialNumber = "A-3042896";

        dm1.Status = "Order Saved";

        dms.Add(dm1);

        DevicesModel dm2 = new DevicesModel();

        dm2.ID = ;

        dm2.DeviceType = "DTM";

        dm2.Manufacturer = "A&D";

        dm2.Model = "UC-DCC-C";

        dm2.SerialNumber = "B-1221-0012";

        dm2.Status = "Order Saved";

        dms.Add(dm2);

        DevicesModel dm3 = new DevicesModel();

        dm3.ID = ;

        dm3.DeviceType = "ATG";

        dm3.Manufacturer = "A&D";

        dm3.Model = "UA-BBL-C";

        dm3.SerialNumber = "B-1001-0012";

        dm3.Status = "Order Saved";

        dms.Add(dm3);

        DevicesModel dm4 = new DevicesModel();

        dm4.ID = ;

        dm4.OrderID = "ORD0002";

        dm4.DeviceType = "ATG";

        dm4.Manufacturer = "CETE";

        dm4.Model = "MC-232";

        dm4.SerialNumber = "";

        dm4.Status = "Order Saved";

        dms.Add(dm4);

        Session["DeviceList"] = dms;

    }

    else

    {

        dms = (List<DevicesModel>)Session["DeviceList"];

    }

    return dms;

}

4. Session的清空：

public string ClearSession()

{

    try

    {

        Session.Remove("DeviceList");

        return "OK";

    }

    catch (Exception ex)

    {

        return ex.Message.ToString();

    }

}

最后，需要注意的是构造函数中不能使用Session，这应该是所有要注意的了！

巴特西

C# Web中Session的使用

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