var query = this.Customers.Select(x=>x); if(!string.IsNullOrWhiteSpace(companyName)) { query = query.Where(x=>x.CompanyName == companyName); } if(!string.IsNullOrWhiteSpace(contactName)) { query = query.Where(x=>x.ContactName == contactName); } if(!string.IsNullOrWhiteSpace(city)) { query = query.Where(x=>x.City == city); }這樣也可以達到效果!
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