我正在使用后台工作人员更新 sqlserver 中的一些表。进度条最大值被设置为正确的值,进度条的值正在递增,backgroundworker progresschanged 正在以正确的值正确调用,但进度条没有进展。
这是 background_dowork 方法中表单的代码,有一个循环调用 updateProgressBarValue,它使用正确的值。
public InterfaceConvertLonLat()
{
InitializeComponent();
Shown += new EventHandler(Form1_Shown);
backgroundWorker1.WorkerReportsProgress = true;
backgroundWorker1.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged);
backgroundWorker1.DoWork += new DoWorkEventHandler(backgroundWorker1_DoWork);
}
public void ConvertLonLat_Load(object sender, EventArgs e)
{
}
public void updateProgressBarValue()
{
progressBar1.Value++;
backgroundWorker1.ReportProgress(progressBar1.Value);
}
public void setProgressBarMax(int max)
{
progressBar1.Maximum = max;
MessageBox.Show("setprogressbarmax " + max);
}
public void Form1_Shown(object sender, EventArgs e)
{
backgroundWorker1.RunWorkerAsync();
}
public void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
convert.OSGB36ToWGS84("paf");
}
public void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
progressBar1.Value = e.ProgressPercentage;
}
这是另一个调用 updateprogressbarvalue 的类中包含的循环,它正在被触发,并且如前所述 backgroundworker1_progressChanged 正在被触发,但条没有移动。
con.setProgressBarMax(address.Tables[0].Rows.Count);
foreach (DataRow LonLat in address.Tables[0].Rows)
{
con.updateProgressBarValue();
Double lon = 0;
Double lat = 0;
lat = Convert.ToDouble(LonLat["LTO"]);
lon = Convert.ToDouble(LonLat["LGO"]);
LocalToWGS84(ref lat, ref lon, OGB_M);
cmd1.Parameters["@LTW"].Value = lat;
cmd1.Parameters["@LGW"].Value = lon;
string dbQuery1 = "update " + tableName + " set LTW = @LTW, LGW = @LGW";
cmd1.CommandText = (dbQuery1);
cmd1.CommandType = CommandType.Text;
cmd1.Connection = conn;
cmd1.ExecuteNonQuery();
}
}
catch (Exception e)
{
MessageBox.Show("error converting: " + e.Message);
}
finally
{
conn.Close();
}