.Net通用分页类,网页显示.静态调用,实为方便
只有二个静态方法,不用在使用中带页码参数,在类中自动获取,很为方便:
GetPagerHTML方法得到显示的页码, 如:首 页 上一页 [1] [2] [3] [4] [5] 下一页 末 页
GetPagerTable方法得到指定页的数据.
调用方法:
DBHelper DB = new DBHelper();
DB.OpenConnection();
string sqlString = "select * From Table_Article";
//得到一个DataTable
DataTable TableB = DB.GetDataTable(sqlString);
//把页码显示到页面上,这一部一定要在Pager.GetPagerTable方法前面;
Label2.Text = Pager.GetPagerHTML(TableB.Rows.Count, 3);
//得到指定页的数据
TableB = Pager.GetPagerTable(TableB, 3);
GridView2.DataSource = TableB;
GridView2.DataBind();
分页类代码如下:
public
class
Pager
{
///
<summary>
///
显示分类字符串 返回字符如:首页 上一页 [2] [3] [4] [5] [6] 下一页 末页 [页次4/10页] [共30条]
///
</summary>
///
<param name="RecordCount">
记录总数
</param>
///
<param name="PageSize">
每页显示多少条
</param>
///
<returns></returns>
public
static
string
GetPagerHTML(
int
RecordCount,
int
PageSize)
{
//
当前URL地址所有参数
string
QueryString
=
HttpContext.Current.Request.QueryString.ToString();
//
返回的显示页字符串
string
BackPageStr
=
""
;
//
总页数
int
pageCount
=
RecordCount
/
PageSize;
if
(RecordCount
%
PageSize
>
0
)
{
pageCount
=
RecordCount
/
PageSize
+
1
;
}
//
当前页数
string
IndexPage
=
HttpContext.Current.Request.QueryString[
"
page
"
];
int
page
=
1
;
if
(IndexPage
!=
null
)
{
try
{
page
=
Convert.ToInt32(IndexPage);
}
catch
{
page
=
1
;
}
}
if
(page
>
pageCount)
{
page
=
pageCount;
}
//
URL后面的参数
string
url
=
""
;
string
strq
=
""
;
string
[] arrq
=
QueryString.Split(
'
&
'
);
if
(arrq.Length
>
0
)
{
for
(
int
i
=
0
; i
<
arrq.Length; i
++
)
{
string
[] arrStrq
=
arrq[i].Split(
'
=
'
);
if
(
!
arrStrq[
0
].Equals(
"
page
"
))
{
//
if (!arrStrq[0].Equals(""))
//
{
//
if (strq.Trim().Equals(""))
//
{
//
strq = "?" + arrStrq[0] + "=" + arrStrq[1];
//
}
//
else
//
{
//
strq += "&" + arrStrq[0] + "=" + arrStrq[1];
//
}
//
}
strq
+=
arrq[i];
}
}
}
if
(strq.Equals(
""
))
{
url
+=
"
?page=
"
;
}
else
{
url
+=
"
?
"
+
strq
+
"
&page=
"
;
}
//
是否为首页
if
(page
>
1
)
{
BackPageStr
+=
"
<a href='
"
+
url
+
(
1
).ToString()
+
"
'>首 页</a>\n
"
;
BackPageStr
+=
"
<a href='
"
+
url
+
(page
-
1
).ToString()
+
"
'>上一页</a>\n
"
;
}
//
显示当前页的前后5页 [1] [2] [3] [4] [5]
int
StartPage;
int
EndPage;
if
(pageCount
>
5
)
{
StartPage
=
page
-
2
;
EndPage
=
page
+
2
;
if
(StartPage
<=
0
) { StartPage
=
1
; }
if
(EndPage
>=
pageCount) { EndPage
=
pageCount; }
if
((EndPage
-
StartPage)
<
4
&&
StartPage
==
1
) { EndPage
=
StartPage
+
4
; }
if
((EndPage
-
StartPage)
<
4
&&
EndPage
==
pageCount) { StartPage
=
EndPage
-
4
; }
}
else
{
StartPage
=
1
;
EndPage
=
pageCount;
}
for
(
int
i
=
StartPage; i
<=
EndPage; i
++
)
{
if
(i
==
page)
{
BackPageStr
+=
"
[<a href='
"
+
url
+
i.ToString()
+
"
'><b>
"
+
i.ToString()
+
"
</b></a>] \n
"
;
}
else
{
BackPageStr
+=
"
[<a href='
"
+
url
+
i.ToString()
+
"
'>
"
+
i.ToString()
+
"
</a>] \n
"
;
}
}
//
是否为最后一页
if
(page
<
pageCount)
{
BackPageStr
+=
"
<a href='
"
+
url
+
(page
+
1
).ToString()
+
"
'>下一页</a>\n
"
;
BackPageStr
+=
"
<a href='
"
+
url
+
pageCount.ToString()
+
"
'>末 页</a>\n
"
;
}
BackPageStr += " [页次" + page.ToString() + "/" + pageCount.ToString() + "页] ";
BackPageStr += " [共" + RecordCount.ToString() + "条] ";
return
BackPageStr;
}
///
<summary>
///
对DataTable进行分页,起始页为1
///
</summary>
///
<param name="dt">
要显示的数据表
</param>
///
<param name="PageSize">
每页显示多少条数据
</param>
///
<returns></returns>
public
static
DataTable GetPagerTable(DataTable dt,
int
PageSize)
{
//
总条数
int
RecordCount
=
dt.Rows.Count;
//
总页数
int
pageCount
=
RecordCount
/
PageSize;
if
(RecordCount
%
PageSize
>
0
)
{
pageCount
=
RecordCount
/
PageSize
+
1
;
}
//
当前页数
string
IndexPage
=
HttpContext.Current.Request.QueryString[
"
page
"
];
int
page
=
1
;
if
(IndexPage
!=
null
)
{
try
{
page
=
Convert.ToInt32(IndexPage);
}
catch
{
page
=
1
;
}
}
if
(page
>
pageCount)
{
page
=
pageCount;
}
DataTable newdt
=
dt.Copy();
newdt.Clear();
int
rowbegin
=
((page
-
1
)
*
PageSize);
int
rowend
=
page
*
PageSize;
if
(rowbegin
>=
RecordCount)
return
newdt;
if
(rowend
>
dt.Rows.Count)rowend
=
dt.Rows.Count;
for
(
int
i
=
rowbegin; i
<=
rowend
-
1
; i
++
)
{
DataRow newdr
=
newdt.NewRow();
DataRow dr
=
dt.Rows[i];
foreach
(DataColumn column
in
dt.Columns)
{
newdr[column.ColumnName]
=
dr[column.ColumnName];
}
newdt.Rows.Add(newdr);
}
return
newdt;
}
}