[英]How can i cast IQueryable<> query to IQueryable<obj.getType()>?
我該如何分解此代碼? 我的過濾器返回幾種類型的文檔。 困難的是我對每種類型都有一些查詢...我想使用一種通用方法來返回正確的查詢
謝謝
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;
}
}
}
呼叫看起來像:
IQueryable<Vente> result = GetData<Vente>( "Vente" );
它會解決您的問題,但我不喜歡它,因為您需要指定類型並且需要一個標識符,您希望執行該選擇。 當您擁有諸如GetData<Vente>( "OtherEntity" )
類的東西時,這可能會很快導致異常。
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