重拾ASP.NET页面间传值

1.Use Query String

注：以前总是忽略了Server.UrlEncode()  AND Server.UrlDecode() 切记，切记！

(1)Source Page

1 protected void QueryStringButton_Click(object sender, EventArgs e)
2         {
3             Response.Redirect("QueryStringPage.aspx?Data=" + Server.UrlEncode(DataToSendTextBox.Text));
4         }

(2)Target Page

1  <form id="form1" runat="server">
2     <div>
3         <h1>Target Page - Query String</h1>
4         The data received from the source page is: <%=Server.UrlDecode(Request.QueryString["Data"]) %><br /><br />
5     </div>
7     </form>

2.Use Session

(1)Source Page

 

1  protected void SessionStateButton_Click(object sender, EventArgs e)
2         {
3             Session["Data"] = DataToSendTextBox.Text;
4             Response.Redirect("SessionStatePage.aspx");
5         }

(2)Target page

 

 <div>
        <h1>Target Page - Session State</h1>
        The data received from the source page is: <%=Session["Data"] %><br /><br />
    </div>
    </form>

3.Use HttpPost

说明：印象中这是第一次见到这种用法，这次该记住了。

(1)Source Page

 <asp:Button ID="HttpPostButton" runat="server" Text="Use HttpPost" 
            PostBackUrl="~/HttpPostPage.aspx"/><br /><br />

(2)Target page

<h1>Target Page - HttpPost</h1>
        The data received from the source page is: <%=Request.Form["DataToSendTextBox"] %><br /><br />
        <fieldset>
        <legend>All form data from the sending page</legend>
            <asp:Label ID="ReceivedDataLabel" runat="server" Text="Label"></asp:Label>
        </fieldset>
        <br />

 

  protected void Page_Load(object sender, EventArgs e)
        {
            System.Text.StringBuilder displayValues =
                new System.Text.StringBuilder();
            System.Collections.Specialized.NameValueCollection
                postedValues = Request.Form;
            String nextKey;
            for (int i = 0; i < postedValues.AllKeys.Length; i++)
            {
                nextKey = postedValues.AllKeys[i];
                if (nextKey.Substring(0, 2) != "__")
                {
                    displayValues.Append("<br>");
                    displayValues.Append(nextKey);
                    displayValues.Append(" = ");
                    displayValues.Append(postedValues[i]);
                }
            }
            ReceivedDataLabel.Text = displayValues.ToString();

        }

4.Use Public Properties

(1)Source Page

 说明：这个方法也是很少用，不过在某些时候还是用得到的。

 public string DataToSend
        {
            get
            {
                return DataToSendTextBox.Text;
            }
        }

        protected void PublicPropertiesButton_Click(object sender, EventArgs e)
        {
            Server.Transfer("PublicPropertiesPage.aspx");
        }

(2)target page

 

<div>
        <h1>Target Page - Public Properties</h1>
        The data received from the source page is: <%=PreviousPage.DataToSend %><br /><br />
        <asp:hyperlink ID="Hyperlink1" runat="server" NavigateUrl="~/Default.aspx">Return to Source Page</asp:hyperlink>
    </div>

5.Use Control Infomation

(1)Source Page

 说明：以前只有在应用母版页时才去FindControl(),长眼见了。

<asp:TextBox ID="DataToSendTextBox" runat="server" Text="Hello World!"></asp:TextBox><br /><br />

 protected void ControlInfoButton_Click(object sender, EventArgs e)
        {
            Server.Transfer("ControlInfoPage.aspx");
        }

(2)Target page

 

<h1>Target Page - Control Info</h1>
        The data received from the source page is: 
        <asp:Label ID="DataReceivedLabel" runat="server" Text="Label"></asp:Label><br /><br />

 

protected void Page_Load(object sender, EventArgs e)
        {
            var textbox = PreviousPage.FindControl("DataToSendTextbox") as TextBox;
            if (textbox != null)
            {
                DataReceivedLabel.Text = textbox.Text;
            }
           
        }

反思：似乎作者没有把Cookies放到这一类来，why？