????3. ????????????????
?????????????????????????????????????????????? ASP.NET ????????????????????????????????????????乲??????????????????????ж????Щ??????????????????????????λ?????? Web ??ó???????????????????ж???????????
????3.1 ????????????????
???????? SourcePage.aspx ?У?????????????????????
????3.1.1 ???????????????????? CurrentCity ??????????????????? textCity ?? TextBox ????????
????public String CurrentCity
????{
????get
????{
????return textCity.Text;
????}
????}
??????????????????????????????????????????????????????????????????????????????/д?????????????????????????????????????κ?Ч?????????????????
????3.1.2 ?????? TargetPage.aspx ???????????????? @ PreviousPageType ?????
???????????????????????????? SourcePage.aspx ?????? PreviousPageType ??
????<%@ PreviousPageType VirtualPath="~/SourcePage.aspx" %>????
????<%@ Reference Page="~/SourcePage.aspx" %>
?????????PreviousPageType ????????? PreviousPage ???????????????
????3.1.3 ?????? TargetPage.aspx ?????У???? PreviousPage ?????????????????????????
???????????????????? SourcePage.aspx ?ж???? CurrentCity ????????
????Label1.Text = PreviousPage.CurrentCity;
????3.2 ????????ó???????л????????
????????? SourcePage.aspx ?????? TargetPage.aspx ???? ASP.NET ?????????λ?????? Web ??ó????У?????????????ж?????е???????????????????????????????????????????????????
???????????У????????????? PreviousPage ??????????????????????? FindControl ????????????????????á?
???????????????????? SourcePage.aspx ?? TextBox1 ?????????????????????? Label1 ?????У?
????if (Page.PreviousPage != null)
????{
????TextBox SourceTextBox = (TextBox)Page.PreviousPage.FindControl("TextBox1");
????if (SourceTextBox != null)
????{
????Label1.Text = SourceTextBox.Text;
????}
????}
???????FindControl ??????????????????????е??????????????????λ??????????У????λ??????У??????????????????????????????????????????????????????????
????3.3 ????????ó???????л?????????
??????????????????????? Web ??ó????У?????????????ж?????????????????????? ASP.NET ??????????????????????????????
????????????????????????????????е????????????
?????????? TargetPage.aspx ?У???? Form ?????????????????/???????????????????????????/??????
???????????????????? SourcePage.aspx ?????????????? ID ???????????? Label1 ?????????????????
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 - 1; i++)
{
nextKey = postedValues.AllKeys[i];
if(nextKey.Substring(0?? 2) != "__")
{
displayValues.Append("<br>");
displayValues.Append(nextKey);
displayValues.Append(" = ");
displayValues.Append(postedValues[i]);
}
}
Label1.Text = displayValues.ToString();
}
?????????ASP.NET ????е?????????????????ε?????? __VIEWSTATE??__EVENTTARGET ?? __EVENTARGUMENT????Щ?????н?????????????á?????????????????????????? (__) ?????????????????ε????