如何从数据访问层中的函数触发进度条
我在类中有一个函数：对于此函数中的每个获取的记录，我将记录写入文件，我还想在进度栏中添加此获取的记录的值/计数，但是此进度栏存在于表单页面中并且函数存在于我的类中，我在表单页面中调用该函数，
这里是该函数的一部分，
this.path_to_file =
ConfigurationManager.AppSettings["ExportDir"] +
DateTime.Now.ToString(ConfigurationManager.AppSettings
["Export_FileName"]) + ConfigurationManager.AppSettings
["Export_Extension"];
FileStream fm = new FileStream
(this.path_to_file, FileMode.Create, FileAccess.ReadWrite,
FileShare.ReadWrite);
StreamWriter sw = new StreamWriter(fm, Encoding.Default);
List<Export> exportRecords = null;
exportRecords = ExportList();
try
{
int i = 0;
foreach (Export ex in exportRecords)
{
sw.Write(ex.ExportLine());
sw.Write(sw.NewLine);
sw.Flush();
i++;
}
}
catch (Exception exc)
{
Log.Write(exc.Message);
}
它返回字符串
I have a function in a class: for each fetched record in this function I write the record to a file, I also want to add the value/count of this fetched record in my progressbar, BUT this progressbar exists in the form page and the function exists in my class, I call the function in the formpage
here is a part of this function
this.path_to_file =
ConfigurationManager.AppSettings["ExportDir"] +
DateTime.Now.ToString(ConfigurationManager.AppSettings
["Export_FileName"]) + ConfigurationManager.AppSettings
["Export_Extension"];
FileStream fm = new FileStream
(this.path_to_file, FileMode.Create, FileAccess.ReadWrite,
FileShare.ReadWrite);
StreamWriter sw = new StreamWriter(fm, Encoding.Default);
List<Export> exportRecords = null;
exportRecords = ExportList();
try
{
int i = 0;
foreach (Export ex in exportRecords)
{
sw.Write(ex.ExportLine());
sw.Write(sw.NewLine);
sw.Flush();
i++;
}
}
catch (Exception exc)
{
Log.Write(exc.Message);
}
it returns strings
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评论（1）
让您的班级提出一个带有进度的事件，您的表格也会相应更新。
或者更好的是，在后台线程上执行此操作：
http:// /msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx
Have your class raise an event with the progress, and your form update accordingly.
Or better yet, do it on a background thread:
http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx