C# 清除数据表
我试图在单击按钮后用新内容刷新DataTable,但它也会再次显示以前的值。我试过clear()但对我不起作用C# 清除数据表,c#,asp.net,gridview,C#,Asp.net,Gridview,我试图在单击按钮后用新内容刷新DataTable,但它也会再次显示以前的值。我试过clear()但对我不起作用 protected void btnListItems_Click(object sender, EventArgs e) { lblMessage.Visible = false; //lblEnddatse.Visible = true; Boolean status = true; Util objUtil = new Util();
protected void btnListItems_Click(object sender, EventArgs e)
{
lblMessage.Visible = false;
//lblEnddatse.Visible = true;
Boolean status = true;
Util objUtil = new Util();
String Message = "";
DateTime SDate = new DateTime();
DateTime EDate = new DateTime();
string str = "";
DataTable tbl = new DataTable();
DataTable dt = new DataTable();
DataRow dr;
String[] s1;
dt.Clear();
//DirectoryInfo d = new DirectoryInfo();
s1 = Directory.GetFiles(@"C:/TextFiles");
for (int i = 0; i <= s1.Length - 1; i++)
{
if (i == 0)
{
//Add Data Grid Columns with name
dt.Columns.Add("FileName");
dt.Columns.Add("GeneratedTime");
}
//Get each file information
FileInfo f = new FileInfo(s1[i]);
FileSystemInfo f1 = new FileInfo(s1[i]);
dr = dt.NewRow();
//Get File name of each file name
dr["FileName"] = f1.Name;
dr["GeneratedTime"] = f1.CreationTime.Date.ToString("dd/MM/yyyy");
string a = f1.CreationTime.Date.ToString("dd/MM/yyyy");
//Insert collected file details in Datatable
string fromdate = txtFromDate.Text.ToString();
string todate = txtToDate.Text.ToString();
if ((DateTime.ParseExact(a.ToString(),"dd/MM/yyyy",System.Globalization.CultureInfo.InvariantCulture)) >= DateTime.ParseExact(fromdate.ToString(),"dd/MM/yyyy",System.Globalization.CultureInfo.InvariantCulture))
{
if ((DateTime.ParseExact(a.ToString(), "dd/MM/yyyy", System.Globalization.CultureInfo.InvariantCulture)) <= DateTime.ParseExact(todate.ToString(), "dd/MM/yyyy", System.Globalization.CultureInfo.InvariantCulture))
{
dt.Rows.Add(dr);
}
}
if ((f.Length / 1024) > 5000)
{
lblMessage.Text = "" + f1.Name + " had reach its size limit.";
}
else
{ }
}
if (dt.Rows.Count > 0)
{
gvFileGenStatus.DataSource = dt;
gvFileGenStatus.DataBind();
}
}
protectedvoid btnListItems\u单击(对象发送方,事件参数e)
{
lblMessage.Visible=false;
//lblEnddatse.Visible=true;
布尔状态=真;
Util objUtil=new Util();
字符串消息=”;
DateTime SDate=新的DateTime();
DateTime EDate=新的日期时间();
字符串str=“”;
DataTable tbl=新的DataTable();
DataTable dt=新的DataTable();
数据行dr;
字符串[]s1;
dt.Clear();
//DirectoryInfo d=新的DirectoryInfo();
s1=Directory.GetFiles(@“C:/TextFiles”);
for(int i=0;i=DateTime.ParseExact(fromdate.ToString(),“dd/MM/yyyy”,System.Globalization.CultureInfo.InvariantCulture))
{
if((DateTime.ParseExact(a.ToString(),“dd/MM/yyyy”,System.Globalization.CultureInfo.InvariantCulture))5000)
{
lblMessage.Text=“+f1.Name+”已达到其大小限制。“;
}
其他的
{ }
}
如果(dt.Rows.Count>0)
{
gvFileGenStatus.DataSource=dt;
gvFileGenStatus.DataBind();
}
}
如何在切换日期后每次单击按钮时刷新datagridview显示的数据。
提前感谢您的帮助。请尝试:
gvFileGenStatus.Rows.Clear();
您使用的是microsoft的
DataGridView
还是它的另一个组件?
dt.Dispose();
or in
DataTable dt_null = new DataTable();
if (dt.Rows.Count > 0)
{
gvFileGenStatus.DataSource = dt_null;
gvFileGenStatus.DataBind();
}