我为日志表创建了一个搜索屏幕。我给用户提供了通过复选框选择他们想要显示的应用程序的选项。如果他们愿意,他们可以选择多个程序,或者至少我想这样做。
无论如何,我有以下问题:
var qry = from logs in model.Logs
where logs.LogDateTime > dateTimePicker_Start.Value &&
logs.LogDateTime < dateTimePicker_End.Value
select logs;
Guid tokenid;
if (Guid.TryParse(textBox_TokenId.Text, out tokenid))
{
qry = qry.Where(x => x.TokenId == tokenid);
}
if (checkBox_DisplayErrors.Checked)
{
qry = qry.Where(x => x.IsException);
}
if (checkBox_WebPortal.Checked)
{
qry = qry.Where(x => x.SourceEnum == "WebPortal");
}
if (checkBox_SubService.Checked)
{
qry = qry.Where(x => x.SourceEnum == "SubService");
}
if (checkBox_TruckRouting.Checked)
{
qry = qry.Where(x => x.SourceEnum == "TruckRouting");
}
if (checkBox_SuburbanHub.Checked)
{
qry = qry.Where(x => x.SourceEnum == "SuburbanHub");
}
if (checkBox_DisplayWarnings.Checked)
{
qry = qry.Where(x => x.IsWarning);
}
if (!string.IsNullOrWhiteSpace(textBox_Contains.Text))
{
qry = qry.Where(x => x.Message.Contains(textBox_Contains.Text));
}
qry = qry.OrderByDescending(x => x.LogDateTime);
var nqry = qry;
我需要以下字段才能成为一个角色:
checkBox_SuburbanHub
checkBox_WebPortal
checkBox_TruckRouting
checkBox_SubService
因此,如果他们检查其中一个或多个,则x.SourceEnum字段可以是已检查项之一。
我如何将这些结合起来,但仍然取决于他们是否已经检查过它们?
答案 0 :(得分:3)
您可以将它们全部添加到列表中,然后使用contains
执行orelse
(实际上生成in
子句),如下所示:
var SourceEnumList = new List<string>();
if (checkBox_WebPortal.Checked)
{
SourceEnumList.Add("WebPortal");
}
if (checkBox_SubService.Checked)
{
SourceEnumList.Add("SubService");
}
if (checkBox_TruckRouting.Checked)
{
SourceEnumList.Add("TruckRouting");
}
if (checkBox_SuburbanHub.Checked)
{
SourceEnumList.Add("SuburbanHub");
}
if (SourceEnumList.Any())
{
qry = qry.Where(x => SourceEnumList.Contains(x.SourceEnum) );
}