我的表单上有一个下拉列表，它应该过滤掉或显示整个项目或特定迭代的标签云。但这很奇怪，因为当我从列表中选择某些迭代时，我会得到不同的结果。有时ascx控件根本不显示，有时它显示标签云，但它不正确，有时它显示正确的。我不知道为什么会这样......请提前感谢您的帮助！
displaycloud.aspx：
<asp:DropDownList ID="filteroptions" runat="server" onselectedindexchanged="filteroptions_SelectedIndexChanged" AutoPostBack="true"></asp:DropDownList>
<asp:UpdatePanel ID="UpdateIteration" runat="server">
<ContentTemplate>
<TagCloud:TagCloudControl ID="TagCloudControl1" runat="server" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="filteroptions" />
</Triggers>
</asp:UpdatePanel>
displaycloud.aspx.cs：
protected void Page_Load(object sender, EventArgs e)
{
proj_name = Request.QueryString["project"].ToString();
proj_id = Request.QueryString["id"].ToString();
SqlConnection conn = new SqlConnection(GetConnectionString());
conn.Open();
cmd = new SqlCommand("Select CONVERT(VARCHAR(10), StartDate, 103) + ' - ' + CONVERT(VARCHAR(10), EndDate, 103) AS Iteration, ProjectIterationID FROM Iterations WHERE ProjectID = '" + proj_id + "'", conn);
cmd.CommandType = CommandType.Text;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);;
conn.Close();
if (!Page.IsPostBack)
{
filteroptions.DataSource = ds;
filteroptions.DataTextField = "Iteration";
filteroptions.DataValueField = "ProjectIterationID";
filteroptions.DataBind();
filteroptions.Items.Insert(0, new System.Web.UI.WebControls.ListItem("Entire Project", "0"));
}
}
protected void filteroptions_SelectedIndexChanged(object sender, EventArgs e)
{
string selected_iteration = filteroptions.SelectedValue;
Session["iteration"] = selected_iteration;
}
ASCX CS文件：
protected void Page_Load(object sender, EventArgs e)
{
proj_name = Request.QueryString["project"].ToString();
proj_id = Request.QueryString["id"].ToString();
if (String.IsNullOrEmpty((string)Session["iteration"]))
{
iteration = "0";
}
else
{
iteration = (string)Session["iteration"];
}
BindTagCloud();
}
private void BindTagCloud()
{
int pro_id = Convert.ToInt32(proj_id);
int iteration_id = Convert.ToInt32(iteration);
var tagSummaryNegative = from af in db.AgileFactors
join psf in db.ProjectStoryFactors on af.AgileFactorID equals psf.AgileFactorID
join s in db.Stories on psf.StoryID equals s.StoryID
join pim in db.ProjectIterationMembers on s.ProjectIterationMemberID equals pim.ProjectIterationMemberID
join it in db.Iterations on pim.ProjectIterationID equals it.ProjectIterationID
join pro in db.Projects on it.ProjectID equals pro.ProjectID
where pro.ProjectID == pro_id &&
pro.ProjectID == it.ProjectID &&
it.ProjectIterationID == pim.ProjectIterationID &&
pim.ProjectIterationMemberID == s.ProjectIterationMemberID && s.StoryCategoryID == 1 &&
s.StoryID == psf.StoryID &&
psf.AgileFactorID == af.AgileFactorID
group af by af.Name into tagGroup
select new
{
Tag = tagGroup.Key,
tagCount = tagGroup.Count()
};
var tagSummaryNegativeIteration = from af in db.AgileFactors
join psf in db.ProjectStoryFactors on af.AgileFactorID equals psf.AgileFactorID
join s in db.Stories on psf.StoryID equals s.StoryID
join pim in db.ProjectIterationMembers on s.ProjectIterationMemberID equals pim.ProjectIterationMemberID
join it in db.Iterations on pim.ProjectIterationID equals it.ProjectIterationID
join pro in db.Projects on it.ProjectID equals pro.ProjectID
where pro.ProjectID == pro_id &&
pro.ProjectID == it.ProjectID &&
it.ProjectIterationID == iteration_id &&
it.ProjectIterationID == pim.ProjectIterationID &&
pim.ProjectIterationMemberID == s.ProjectIterationMemberID && s.StoryCategoryID == 1 &&
s.StoryID == psf.StoryID &&
psf.AgileFactorID == af.AgileFactorID
group af by af.Name into tagGroup
select new
{
Tag = tagGroup.Key,
tagCount = tagGroup.Count()
};
var tagSummaryPositive = from af in db.AgileFactors
join psf in db.ProjectStoryFactors on af.AgileFactorID equals psf.AgileFactorID
join s in db.Stories on psf.StoryID equals s.StoryID
join pim in db.ProjectIterationMembers on s.ProjectIterationMemberID equals pim.ProjectIterationMemberID
join it in db.Iterations on pim.ProjectIterationID equals it.ProjectIterationID
join pro in db.Projects on it.ProjectID equals pro.ProjectID
where pro.ProjectID == pro_id &&
pro.ProjectID == it.ProjectID &&
it.ProjectIterationID == pim.ProjectIterationID &&
pim.ProjectIterationMemberID == s.ProjectIterationMemberID && s.StoryCategoryID == 0 &&
s.StoryID == psf.StoryID &&
psf.AgileFactorID == af.AgileFactorID
group af by af.Name into tagGroup
select new
{
Tag = tagGroup.Key,
tagCount = tagGroup.Count()
};
var tagSummaryPositiveIteration = from af in db.AgileFactors
join psf in db.ProjectStoryFactors on af.AgileFactorID equals psf.AgileFactorID
join s in db.Stories on psf.StoryID equals s.StoryID
join pim in db.ProjectIterationMembers on s.ProjectIterationMemberID equals pim.ProjectIterationMemberID
join it in db.Iterations on pim.ProjectIterationID equals it.ProjectIterationID
join pro in db.Projects on it.ProjectID equals pro.ProjectID
where pro.ProjectID == pro_id &&
pro.ProjectID == it.ProjectID &&
it.ProjectIterationID == iteration_id &&
it.ProjectIterationID == pim.ProjectIterationID &&
pim.ProjectIterationMemberID == s.ProjectIterationMemberID && s.StoryCategoryID == 0 &&
s.StoryID == psf.StoryID &&
psf.AgileFactorID == af.AgileFactorID
group af by af.Name into tagGroup
select new
{
Tag = tagGroup.Key,
tagCount = tagGroup.Count()
};
int maxTagFrequencyNegative = (from t in tagSummaryNegative select (int?)t.tagCount).Max() ?? 0;
int maxTagFrequencyPositive = (from t in tagSummaryPositive select (int?)t.tagCount).Max() ?? 0;
int maxTagFrequencyNegativeIteration = (from t in tagSummaryNegativeIteration select (int?)t.tagCount).Max() ?? 0;
int maxTagFrequencyPositiveIteration = (from t in tagSummaryPositiveIteration select (int?)t.tagCount).Max() ?? 0;
var tagCloudNegative = from af in db.AgileFactors
join psf in db.ProjectStoryFactors on af.AgileFactorID equals psf.AgileFactorID
join s in db.Stories on psf.StoryID equals s.StoryID
join pim in db.ProjectIterationMembers on s.ProjectIterationMemberID equals pim.ProjectIterationMemberID
join it in db.Iterations on pim.ProjectIterationID equals it.ProjectIterationID
join pro in db.Projects on it.ProjectID equals pro.ProjectID
where pro.ProjectID == pro_id &&
pro.ProjectID == it.ProjectID &&
it.ProjectIterationID == pim.ProjectIterationID &&
pim.ProjectIterationMemberID == s.ProjectIterationMemberID && s.StoryCategoryID == 1 &&
s.StoryID == psf.StoryID &&
psf.AgileFactorID == af.AgileFactorID
group af by af.Name into tagGroup
select new
{
Tag = tagGroup.Key,
weight = (double)tagGroup.Count() / maxTagFrequencyNegative * 100
};
var tagCloudNegativeIteration = from af in db.AgileFactors
join psf in db.ProjectStoryFactors on af.AgileFactorID equals psf.AgileFactorID
join s in db.Stories on psf.StoryID equals s.StoryID
join pim in db.ProjectIterationMembers on s.ProjectIterationMemberID equals pim.ProjectIterationMemberID
join it in db.Iterations on pim.ProjectIterationID equals it.ProjectIterationID
join pro in db.Projects on it.ProjectID equals pro.ProjectID
where pro.ProjectID == pro_id &&
pro.ProjectID == it.ProjectID &&
it.ProjectIterationID == iteration_id &&
it.ProjectIterationID == pim.ProjectIterationID &&
pim.ProjectIterationMemberID == s.ProjectIterationMemberID && s.StoryCategoryID == 1 &&
s.StoryID == psf.StoryID &&
psf.AgileFactorID == af.AgileFactorID
group af by af.Name into tagGroup
select new
{
Tag = tagGroup.Key,
weight = (double)tagGroup.Count() / maxTagFrequencyNegative * 100
};
var tagCloudPositive = from af in db.AgileFactors
join psf in db.ProjectStoryFactors on af.AgileFactorID equals psf.AgileFactorID
join s in db.Stories on psf.StoryID equals s.StoryID
join pim in db.ProjectIterationMembers on s.ProjectIterationMemberID equals pim.ProjectIterationMemberID
join it in db.Iterations on pim.ProjectIterationID equals it.ProjectIterationID
join pro in db.Projects on it.ProjectID equals pro.ProjectID
where pro.ProjectID == pro_id &&
pro.ProjectID == it.ProjectID &&
it.ProjectIterationID == pim.ProjectIterationID &&
pim.ProjectIterationMemberID == s.ProjectIterationMemberID && s.StoryCategoryID == 0 &&
s.StoryID == psf.StoryID &&
psf.AgileFactorID == af.AgileFactorID
group af by af.Name into tagGroup
select new
{
Tag = tagGroup.Key,
weight = (double)tagGroup.Count() / maxTagFrequencyNegative * 100
};
var tagCloudPositiveIteration = from af in db.AgileFactors
join psf in db.ProjectStoryFactors on af.AgileFactorID equals psf.AgileFactorID
join s in db.Stories on psf.StoryID equals s.StoryID
join pim in db.ProjectIterationMembers on s.ProjectIterationMemberID equals pim.ProjectIterationMemberID
join it in db.Iterations on pim.ProjectIterationID equals it.ProjectIterationID
join pro in db.Projects on it.ProjectID equals pro.ProjectID
where pro.ProjectID == pro_id &&
pro.ProjectID == it.ProjectID &&
it.ProjectIterationID == iteration_id &&
it.ProjectIterationID == pim.ProjectIterationID &&
pim.ProjectIterationMemberID == s.ProjectIterationMemberID && s.StoryCategoryID == 0 &&
s.StoryID == psf.StoryID &&
psf.AgileFactorID == af.AgileFactorID
group af by af.Name into tagGroup
select new
{
Tag = tagGroup.Key,
weight = (double)tagGroup.Count() / maxTagFrequencyNegative * 100
};
if (iteration_id != 0)
{
ListView1.DataSource = tagCloudNegativeIteration;
ListView1.DataBind();
ListView2.DataSource = tagCloudPositiveIteration;
ListView2.DataBind();
}
else
{
ListView1.DataSource = tagCloudNegative;
ListView1.DataBind();
ListView2.DataSource = tagCloudPositive;
ListView2.DataBind();
}
}
答案 0 :(得分：0)
据我了解，您使用filteroptions_SelectedIndexChanged方法将选定的迭代放入会话中。然后使用标记云控制上的会话值来绑定正确的数据。但是，事件处理程序在页面和控件的加载事件之后执行。我建议你在稍后的某个时间点绑定标签云（例如Page_PreRender）。
编辑： 我认为您应该使用以下代码段替换ASCX.CS文件中的Page_Load方法：
protected void Page_Load(object sender, EventArgs e)
{
proj_name = Request.QueryString["project"].ToString();
proj_id = Request.QueryString["id"].ToString();
}
protected void Page_PreRender(object sender, EventArgs e)
{
if (String.IsNullOrEmpty((string)Session["iteration"]))
{
iteration = "0";
}
else
{
iteration = (string)Session["iteration"];
}
BindTagCloud();
}