我在 c# 的一个类中声明了一个全局变量
public partial class admin_AnalyseQuery : System.Web.UI.Page
{
llvsMasterpage m;
private const string ASCENDING = " ASC";
private const string DESCENDING = " DESC";
DataTable dt;
在这里,我创建了一个数据表 dt 作为全局变量,对吗?
现在数据表 dt 填充了屏幕截图中的方法
“BindDatagvAnalyse” - 这是一种将数据绑定到网格视图的方法。
private void BindDatagvAnalyse()
{
Guid SchoolID = Guid.Parse(School.SelectedValue);
Guid YearID = Guid.Parse(Years.SelectedValue);
Guid VersionID = Guid.Parse(Versions.SelectedValue);
Guid LessonID = Guid.Parse(Lessons.SelectedValue);
Guid TeacherID = Guid.Parse(Teachers.SelectedValue);
Guid LearningunitID = Guid.Parse(Learningunits.SelectedValue);
Guid DomainID = Guid.Parse(Domain.SelectedValue);
pnllbl.Visible = true;
string Schoolname = School.SelectedItem.Text;
string Yearname = Years.SelectedItem.Text;
string Versionname = Versions.SelectedItem.Text;
string Lessonnmae = Lessons.SelectedItem.Text;
string Teachername = Teachers.SelectedItem.Text;
string Learningunitname = Learningunits.SelectedItem.Text;
string Domainname = Domain.SelectedItem.Text;
lblinfo.Text = Schoolname + "/" + Yearname + "/" + Lessonnmae + "/" + Versionname + "/" + Teachername + "/" + Domainname + "/" + Learningunitname;
// Guid PeriodID = Guid.Parse(Periods.SelectedValue);
dt = m.bussinesCollection.BussinesDomain.GetAllDetailsForgvanalyse(SchoolID, YearID, LessonID, VersionID, TeacherID, LearningunitID, DomainID);
int count = dt.Rows.Count;
lblcount.Text = count.ToString();
int c = m.bussinesCollection.BussinesDomain.GetAllDetailsForgvanalyseCount(SchoolID, YearID, LessonID, VersionID, TeacherID, LearningunitID, DomainID);
lblstd.Text = c.ToString();
gvAnalyse.DataSource = dt;
gvAnalyse.DataBind();
}
我已经创建了这种类型的 6 种方法,它们将根据下拉选择创建表,然后调用相应的方法并相应地填充 gvanalysis,这会显示在屏幕上。
现在我放了一个按钮来从表中创建 excel 表。
在“导出 Excel”按钮单击事件中,我必须使用当前显示在屏幕中的表格创建 Excel 工作表。
为此,在按钮单击事件中,我已经这样做了
protected void btnexel_Click(object sender, EventArgs e)
{
byte[] Result;
using (MemoryStream ms = new MemoryStream())
{
string school = School.SelectedItem.Text;
string year = Years.SelectedItem.Text;
DataTable final = dt;
// DataTable dt = m.bussinesCollection.BussinesDomain.GetAllDetailsForgvanalyse(SchoolID, YearID, LessonID, VersionID, TeacherID, LearningunitID, DomainID);
string style = @"<style> .textmode { mso-number-format:\@; } </style>";
Response.Write(style);
Result = ms.GetBuffer();
Session["Excel"] = Result;
Session["dt"] = final;
Session["school"] = school;
Session["year"] = year;
Session["pdf/excel"] = "excel/loondiest/analyse";
Response.Redirect("~/admin/DownloadPdf.aspx");
}
}
但是当我调试它时,它总是显示 table final & dt 都是空的。
我该怎么办?