[英]How can i cast IQueryable<> query to IQueryable<obj.getType()>?
我该如何分解此代码? 我的过滤器返回几种类型的文档。 困难的是我对每种类型都有一些查询...我想使用一种通用方法来返回正确的查询
谢谢
if(this.comboBoxType.Text.Equals("Vente"))
{
IQueryable<Vente> queryV = ContexteDAO.ContexteDonnees.Vente
.Include("Client")
.Include("Paiement")
.Include("Employe").OrderBy(v => v.venteID);
if (this.tbxNomCli.Text != "")
queryV = queryV.Where(v => v.Client.nom.Contains(this.tbxNomCli.Text));
if (this.comboBoxEtat.Text != "Tous")
queryV = queryV.Where(v => v.etat == this.comboBoxEtat.Text);
if (this.checkBoxDate.Checked)
queryV = queryV.Where(v => v.date.Equals(this.dateTimePicker.Value.Date));
if (this.tbxTva.Text != "")
queryV = queryV.Where(v => v.Client.numEntreprise.Contains(this.tbxTva.Text));
if (this.checkBoxVendeur.Checked)
{
Employe employe = this.comboBoxVendeur.SelectedItem as Employe;
queryV = queryV.Where(v => v.Employe.login.Equals(employe.login));
}
this.documentBindingSource.DataSource = queryV.ToList();
}
if (this.comboBoxType.Text.Equals("Commande"))
{
IQueryable<Commande> queryC = ContexteDAO.ContexteDonnees.Commande
.Include("Client")
.Include("Paiement")
.Include("Employe").OrderBy(c => c.commandeID);
if (this.tbxNomCli.Text != "")
queryC = queryC.Where(v => v.Client.nom.Contains(this.tbxNomCli.Text));
if (this.comboBoxEtat.Text != "Tous")
queryC = queryC.Where(v => v.etat == this.comboBoxEtat.Text);
if (this.checkBoxDate.Checked)
queryC = queryC.Where(v => v.date.Equals(this.dateTimePicker.Value.Date));
if (this.tbxTva.Text != "")
queryC = queryC.Where(v => v.Client.numEntreprise.Contains(this.tbxTva.Text));
if (this.checkBoxVendeur.Checked)
{
Employe employe = this.comboBoxVendeur.SelectedItem as Employe;
queryC = queryC.Where(v => v.Employe.login.Equals(employe.login));
}
this.documentBindingSource.DataSource = queryC.ToList();
}
您可以采用通用方法:
public IQueryable<T> GetData<T>( string identifier )
{
switch( identifier )
{
case "Vente":
{
return ContexteDAO.ContexteDonnees.Vente
.Include("Client")
.Include("Paiement")
.Include("Employe")
.OrderBy(v => v.venteID);
// do more stuff
break;
}
// add more cases
default:
{
return null;
}
}
}
呼叫看起来像:
IQueryable<Vente> result = GetData<Vente>( "Vente" );
它会解决您的问题,但我不喜欢它,因为您需要指定类型并且需要一个标识符,您希望执行该选择。 当您拥有诸如GetData<Vente>( "OtherEntity" )
类的东西时,这可能会很快导致异常。
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