条码打印异步调用
做了将近一年的进销存软件产品，今天无意中发现了一个对象
代码
代码
BackgroundWorker
后台线程处理，觉得挺管用，所以做了一个很小的Demo（条码打印），界面给人一种很真实的感觉，好，切入正题，
所以我们来看看效果图：
好，相信现在大家都已经看到了这种效果图了，好，我们看看代码的实现：
首先： 我们搭建一个业务逻辑层，类名为：ParamUtil
我们看看代码：
代码
using
System;
using
System.Collections.Generic;
using
System.Linq;
using
System.Text;
using
System.Data;
using
System.Data.SqlClient;
namespace
Action
{
public
class
ParamUtil
{
///
<summary>
///
构造函数
///
</summary>
///
<param name="cmd"></param>
public
ParamUtil(
string
cmd)
{
}
///
<summary>
///
构造函数
///
</summary>
///
<param name="cmd"></param>
public
ParamUtil()
{
}
///
<summary>
///
初始化数据
///
</summary>
public
DataTable CBind1()
{
DataTable dt
=
new
DataTable();
dt.Columns.Add(
"
a
"
,
typeof
(
string
));
dt.Columns.Add(
"
b
"
,
typeof
(
string
));
dt.Columns.Add(
"
c
"
,
typeof
(
string
));
//
造数据
for
(
int
i
=
0
; i
<
100
;
++
i )
{
DataRow dr
=
dt.NewRow();
dr[
"
a
"
]
=
"
颜色
"
;
dr[
"
b
"
]
=
"
尺码
"
;
dr[
"
c
"
]
=
"
未打印
"
;
dt.Rows.Add(dr);
}
return
dt;
}
}
}
好，现在我们的业务逻辑层已经搭建好，我们来看客户端的实现：
代码
using
System;
using
System.Collections.Generic;
using
System.ComponentModel;
using
System.Data;
using
System.Drawing;
using
System.Linq;
using
System.Text;
using
System.Windows.Forms;
using
Action;
namespace
WindowsFormsApplication1
{
public
partial
class
Form1 : Form
{
public
Form1()
{
InitializeComponent();
}
#region
设计说明
#endregion
#region
变动记录
//
Ver 1.0.0.1 (2010-11-29) Andy20101987 初始化数据
#endregion
#region
变量
///
<summary>
///
后台线程
///
</summary>
private
BackgroundWorker bgw;
///
<summary>
///
设置datagridview第一行的索引值
///
</summary>
///
<param name="rowindex"></param>
private
delegate
void
ChangeDGVFirstDisplayedScrolling(
int
rowindex);
#endregion
#region
框架方法
///
<summary>
///
窗体加载事件
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
private
void
Form1_Load(
object
sender, EventArgs e)
{
//
实例化
Action.ParamUtil paramutil
=
new
ParamUtil();
DataTable dt
=
new
DataTable();
dt
=
paramutil.CBind1();
this
.bindingSource1.DataMember
=
dt.TableName;
this
.bindingSource1.DataSource
=
dt;
this
.toolStripProgressBar1.Maximum
=
bindingSource1.Count;
}
#endregion
#region
成员方法
///
<summary>
///
打印
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
private
void
btnPrint_Click(
object
sender, EventArgs e)
{
this
.toolStripStatusLabel1.Text
=
"
正在打印...
"
;
bgw
=
new
BackgroundWorker();
bgw.WorkerReportsProgress
=
true
;
bgw.WorkerSupportsCancellation
=
true
;
bgw.DoWork
+=
new
DoWorkEventHandler(bgw_DoWork);
bgw.ProgressChanged
+=
new
ProgressChangedEventHandler(bgw_ProgressChanged);
bgw.RunWorkerCompleted
+=
new
RunWorkerCompletedEventHandler(bgw_RunWorkerCompleted);
bgw.RunWorkerAsync();
}
#endregion
#region
事件
///
<summary>
///
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
void
bgw_DoWork(
object
sender, DoWorkEventArgs e)
{
bindingSource1.MoveFirst();
int
rowPosition
=
bindingSource1.Position;
while
(rowPosition
<=
bindingSource1.Count)
{
if
(bgw.CancellationPending)
break
;
this
.dataGridView1.Rows[bindingSource1.Position].Selected
=
true
;
DataRowView currentRowView
=
bindingSource1.Current
as
DataRowView;
currentRowView.Row[
"
c
"
]
=
"
正在打印...
"
;
System.Threading.Thread.Sleep(
1000
);
currentRowView.Row[
"
c
"
]
=
"
打印完成！
"
;
this
.dataGridView1.Rows[rowPosition].DefaultCellStyle.ForeColor
=
Color.Red;
if
(bindingSource1.Position
>
6
)
{
bgw.ReportProgress(bindingSource1.Position
-
6
);
}
else
{
bgw.ReportProgress(
0
);
}
bindingSource1.MoveNext();
rowPosition
++
;
}
bgw.Dispose();
}
///
<summary>
///
停止
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
private
void
btnStop_Click(
object
sender, EventArgs e)
{
this
.toolStripStatusLabel1.Text
=
"
取消打印！
"
;
this
.toolStripProgressBar1.Value
=
0
;
bgw.CancelAsync();
bgw.Dispose();
}
///
<summary>
///
退出
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
private
void
btnExit_Click(
object
sender, EventArgs e)
{
Close();
}
///
<summary>
///
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
void
bgw_ProgressChanged(
object
sender, ProgressChangedEventArgs e)
{
dataGridView1.FirstDisplayedScrollingRowIndex
=
e.ProgressPercentage;
dataGridView1.Refresh();
if
(
this
.toolStripProgressBar1.Value.Equals(bindingSource1.Count))
{
toolStripProgressBar1.Value
=
bindingSource1.Count;
}
else
{
toolStripProgressBar1.Value
++
;
}
}
///
<summary>
///
///
</summary>
///
<param name="sender"></param>
///
<param name="e"></param>
void
bgw_RunWorkerCompleted(
object
sender, RunWorkerCompletedEventArgs e)
{
this
.toolStripStatusLabel1.Text
=
"
打印完成！
"
;
}
#endregion
}
}
好，现在客户端也组建好，就可以看到我们上面的效果图了，大家感觉试一试，希望对大家有所帮助，
因为时间比较匆忙，今天就写在这，后期会对其进行更详细的述说，也会发表更多的文章，希望大家一起
来学习。