- Simple Where Clause
- Join and Simple Where Clause
- Distinct Operator
- Simple Inner Join
- Self Join
- Double or Multiple Joins
- Join using Entity Fields
- Late-Binding Left Join
- Equals Operator
- Not Equals Operator
- Method Based LINQ Query with Where Clause
- Greater Than Operator
- Greater Than or Equals and Less Than or Equals Operator
- Contain Operator
- Does Not Contain Operator
- StartsWith and EndsWith Operator
- AND and OR Operator
- OrderBy Operator
- First and Single Operator
- Retrieve Formatted Values
- Skip and Take Operator without Paging
- FirstOrDefault or SingleOrDefault Operator
- Self Join with condition on Linked Entity
- Transformation in Where Clause
- Paging Sort
- Retrieve Related Entity Column (1 to N Relationship)
- .Value to Retrieve the Value of Attribute
- Multiple Projections, new data type casting to different types
- GetAttributeValue Method
- Math Methods
- Multiple Select and Where Clauses
- Select Many
- String Operation
- Two Where Clauses
- Load Property to Retrieve Related Products
All codes are written in C#, if you want code in VB.Net then convert your code here.
- Simple Where Clause
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_where1 = from a in svcContext.AccountSet
where a.Name.Contains("Contoso")
select a;
foreach (var a in query_where1)
{
System.Console.WriteLine(a.Name + " " + a.Address1_City);
}
}
- Join and Simple Where Clause
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_where3 = from c in svcContext.ContactSet
join a in svcContext.AccountSet
on c.ContactId equals a.PrimaryContactId.Id
where a.Name.Contains("Contoso")
where c.LastName.Contains("Smith")
select new
{
account_name = a.Name,
contact_name = c.LastName
};
foreach (var c in query_where3)
{
System.Console.WriteLine("acct: " +
c.account_name +
"\t\t\t" +
"contact: " +
c.contact_name);
}
}
- Distinct Operator
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_distinct = (from c in svcContext.ContactSet
select c.LastName).Distinct();
foreach (var c in query_distinct)
{
System.Console.WriteLine(c);
}
}
- Simple Inner Join
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_join1 = from c in svcContext.ContactSet
join a in svcContext.AccountSet
on c.ContactId equals a.PrimaryContactId.Id
select new
{
c.FullName,
c.Address1_City,
a.Name,
a.Address1_Name
};
foreach (var c in query_join1)
{
System.Console.WriteLine("acct: " +
c.Name +
"\t\t\t" +
"contact: " +
c.FullName);
}
}
- Self Join
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_join5 = from a in svcContext.AccountSet
join a2 in svcContext.AccountSet
on a.ParentAccountId.Id equals a2.AccountId
select new
{
account_name = a.Name,
account_city = a.Address1_City
};
foreach (var c in query_join5)
{
System.Console.WriteLine(c.account_name + " " + c.account_city);
}
}
- Double or Multiple Joins
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_join4 = from a in svcContext.AccountSet
join c in svcContext.ContactSet
on a.PrimaryContactId.Id equals c.ContactId
join l in svcContext.LeadSet
on a.OriginatingLeadId.Id equals l.LeadId
select new
{
contact_name = c.FullName,
account_name = a.Name,
lead_name = l.FullName
};
foreach (var c in query_join4)
{
System.Console.WriteLine(c.contact_name +
" " +
c.account_name +
" " +
c.lead_name);
}
}
- Join using Entity Fields
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var list_join = (from a in svcContext.AccountSet
join c in svcContext.ContactSet
on a.PrimaryContactId.Id equals c.ContactId
where a.Name == "Contoso Ltd" &&
a.Address1_Name == "Contoso Pharmaceuticals"
select a).ToList();
foreach (var c in list_join)
{
System.Console.WriteLine("Account " + list_join[0].Name
+ " and it's primary contact "
+ list_join[0].PrimaryContactId.Id);
}
}
- Late-Binding Left Join
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_join8 = from a in svcContext.AccountSet
join c in svcContext.ContactSet
on a.PrimaryContactId.Id equals c.ContactId
into gr
from c_joined in gr.DefaultIfEmpty()
select new
{
contact_name = c_joined.FullName,
account_name = a.Name
};
foreach (var c in query_join8)
{
System.Console.WriteLine(c.contact_name + " " + c.account_name);
}
}
- Equals Operator
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_equals1 = from c in svcContext.ContactSet
where c.FirstName.Equals("Colin")
select new
{
c.FirstName,
c.LastName,
c.Address1_City
};
foreach (var c in query_equals1)
{
System.Console.WriteLine(c.FirstName +
" " + c.LastName +
" " + c.Address1_City);
}
}
- Not Equals Operator
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_ne1 = from c in svcContext.ContactSet
where c.Address1_City != "Redmond"
select new
{
c.FirstName,
c.LastName,
c.Address1_City
};
foreach (var c in query_ne1)
{
System.Console.WriteLine(c.FirstName + " " +
c.LastName + " " + c.Address1_City);
}
}
- Method Based LINQ Query with Where Clause
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var methodResults = svcContext.ContactSet
.Where(a => a.LastName == "Smith");
var methodResults2 = svcContext.ContactSet
.Where(a => a.LastName.StartsWith("Smi"));
Console.WriteLine();
Console.WriteLine("Method query using Lambda expression");
Console.WriteLine("---------------------------------------");
foreach (var a in methodResults)
{
Console.WriteLine("Name: " + a.FirstName + " " + a.LastName);
}
Console.WriteLine("---------------------------------------");
Console.WriteLine("Method query 2 using Lambda expression");
Console.WriteLine("---------------------------------------");
foreach (var a in methodResults2)
{
Console.WriteLine("Name: " + a.Attributes["firstname"] +
" " + a.Attributes["lastname"]);
}
}
- Greater Than Operator
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_gt1 = from c in svcContext.ContactSet
where c.Anniversary > new DateTime(2010, 2, 5)
select new
{
c.FirstName,
c.LastName,
c.Address1_City
};
foreach (var c in query_gt1)
{
System.Console.WriteLine(c.FirstName + " " +
c.LastName + " " + c.Address1_City);
}
}
- Greater Than or Equals and Less Than or Equals Operator
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_gele1 = from c in svcContext.ContactSet
where c.CreditLimit.Value >= 200 &&
c.CreditLimit.Value <= 400
select new
{
c.FirstName,
c.LastName
};
foreach (var c in query_gele1)
{
System.Console.WriteLine(c.FirstName + " " + c.LastName);
}
}
- Contain Operator
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_contains1 = from c in svcContext.ContactSet
where c.Description.Contains("Alpine")
select new
{
c.FirstName,
c.LastName
};
foreach (var c in query_contains1)
{
System.Console.WriteLine(c.FirstName + " " + c.LastName);
}
}
- Does Not Contain Operator
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_contains2 = from c in svcContext.ContactSet
where !c.Description.Contains("Coho")
select new
{
c.FirstName,
c.LastName
};
foreach (var c in query_contains2)
{
System.Console.WriteLine(c.FirstName + " " + c.LastName);
}
}
- StartsWith and EndsWith Operator
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_startswith1 = from c in svcContext.ContactSet
where c.FirstName.StartsWith("Bri")
select new
{
c.FirstName,
c.LastName
};
foreach (var c in query_startswith1)
{
System.Console.WriteLine(c.FirstName + " " + c.LastName);
}
}
- AND and OR Operator
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_andor1 = from c in svcContext.ContactSet
where ((c.Address1_City == "Redmond" ||
c.Address1_City == "Bellevue") &&
(c.CreditLimit.Value != null &&
c.CreditLimit.Value >= 200))
select c;
foreach (var c in query_andor1)
{
System.Console.WriteLine(c.LastName + ", " + c.FirstName + " " +
c.Address1_City + " " + c.CreditLimit.Value);
}
}
- OrderBy Operator
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_orderby1 = from c in svcContext.ContactSet
where !c.CreditLimit.Equals(null)
orderby c.CreditLimit descending
select new
{
limit = c.CreditLimit,
first = c.FirstName,
last = c.LastName
};
foreach (var c in query_orderby1)
{
System.Console.WriteLine(c.limit.Value + " " +
c.last + ", " + c.first);
}
}
- First and Single Operator
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
Contact firstcontact = svcContext.ContactSet.First();
Contact singlecontact = svcContext.ContactSet.Single(c => c.ContactId == _contactId1);
System.Console.WriteLine(firstcontact.LastName + ", " +
firstcontact.FirstName + " is the first contact");
System.Console.WriteLine("==========================");
System.Console.WriteLine(singlecontact.LastName + ", " +
singlecontact.FirstName + " is the single contact");
}
- Retrieve Formatted Values
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var list_retrieve1 = from c in svcContext.ContactSet
where c.ContactId == _contactId1
select new { StatusReason = c.FormattedValues["statuscode"] };
foreach (var c in list_retrieve1)
{
System.Console.WriteLine("Status: " + c.StatusReason);
}
}
- Skip and Take Operator without Paging
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_skip = (from c in svcContext.ContactSet
where c.LastName != "Parker"
orderby c.FirstName
select new
{
last = c.LastName,
first = c.FirstName
}).Skip(2).Take(2);
foreach (var c in query_skip)
{
System.Console.WriteLine(c.first + " " + c.last);
}
}
- FirstOrDefault or SingleOrDefault Operator
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
Contact firstorcontact = svcContext.ContactSet.FirstOrDefault();
Contact singleorcontact = svcContext.ContactSet
.SingleOrDefault(c => c.ContactId == _contactId1);
System.Console.WriteLine(firstorcontact.FullName +
" is the first contact");
System.Console.WriteLine("==========================");
System.Console.WriteLine(singleorcontact.FullName +
" is the single contact");
}
- Self Join with condition on Linked Entity
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_joincond = from a1 in svcContext.AccountSet
join a2 in svcContext.AccountSet
on a1.ParentAccountId.Id equals a2.AccountId
where a2.AccountId == _accountId1
select new { Account = a1, Parent = a2 };
foreach (var a in query_joincond)
{
System.Console.WriteLine(a.Account.Name + " " + a.Parent.Name);
}
}
- Transformation in Where Clause
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_wheretrans = from c in svcContext.ContactSet
where c.ContactId == _contactId1 &&
c.Anniversary > DateTime.Parse("1/1/2010")
select new
{
c.FirstName,
c.LastName
};
foreach (var c in query_wheretrans)
{
System.Console.WriteLine(c.FirstName + " " + c.LastName);
}
}
- Paging Sort
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_pagingsort1 = (from c in svcContext.ContactSet
where c.LastName != "Parker"
orderby c.LastName ascending,
c.FirstName descending
select new { c.FirstName, c.LastName })
.Skip(2).Take(2);
foreach (var c in query_pagingsort1)
{
System.Console.WriteLine(c.FirstName + " " + c.LastName);
}
}
- Retrieve Related Entity Column (1 to N Relationship)
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_retrieve1 = from c in svcContext.ContactSet
join a in svcContext.AccountSet
on c.ContactId equals a.PrimaryContactId.Id
where c.ContactId != _contactId1
select new { Contact = c, Account = a };
foreach (var c in query_retrieve1)
{
System.Console.WriteLine("Acct: " + c.Account.Name +
"\t\t" + "Contact: " + c.Contact.FullName);
}
}
- .Value to Retrieve the Value of Attribute
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_value = from c in svcContext.ContactSet
where c.ContactId != _contactId2
select new
{
ContactId = c.ContactId != null ?
c.ContactId.Value : Guid.Empty,
NumberOfChildren = c.NumberOfChildren != null ?
c.NumberOfChildren.Value : default(int),
CreditOnHold = c.CreditOnHold != null ?
c.CreditOnHold.Value : default(bool),
Anniversary = c.Anniversary != null ?
c.Anniversary.Value : default(DateTime)
};
foreach (var c in query_value)
{
System.Console.WriteLine(c.ContactId + " " + c.NumberOfChildren +
" " + c.CreditOnHold + " " + c.Anniversary);
}
}
- Multiple Projections, new data type casting to different types
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_projections = from c in svcContext.ContactSet
where c.ContactId == _contactId1
&& c.NumberOfChildren != null &&
c.Anniversary.Value != null
select new
{
Contact = new Contact {
LastName = c.LastName,
NumberOfChildren = c.NumberOfChildren
},
NumberOfChildren = (double)c.NumberOfChildren,
Anniversary = c.Anniversary.Value.AddYears(1),
};
foreach (var c in query_projections)
{
System.Console.WriteLine(c.Contact.LastName + " " +
c.NumberOfChildren + " " + c.Anniversary);
}
}
- GetAttributeValue Method
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_getattrib = from c in svcContext.ContactSet
where c.GetAttributeValue<Guid>("contactid") != _contactId1
select new
{
ContactId = c.GetAttributeValue<Guid?>("contactid"),
NumberOfChildren = c.GetAttributeValue<int?>("numberofchildren"),
CreditOnHold = c.GetAttributeValue<bool?>("creditonhold"),
Anniversary = c.GetAttributeValue<DateTime?>("anniversary"),
};
foreach (var c in query_getattrib)
{
System.Console.WriteLine(c.ContactId + " " + c.NumberOfChildren +
" " + c.CreditOnHold + " " + c.Anniversary);
}
}
- Math Methods
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_math = from c in svcContext.ContactSet
where c.ContactId != _contactId2
&& c.Address1_Latitude != null &&
c.Address1_Longitude != null
select new
{
Round = Math.Round(c.Address1_Latitude.Value),
Floor = Math.Floor(c.Address1_Latitude.Value),
Ceiling = Math.Ceiling(c.Address1_Latitude.Value),
Abs = Math.Abs(c.Address1_Latitude.Value),
};
foreach (var c in query_math)
{
System.Console.WriteLine(c.Round + " " + c.Floor +
" " + c.Ceiling + " " + c.Abs);
}
}
- Multiple Select and Where Clauses
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_multiselect = svcContext.IncidentSet
.Where(i => i.IncidentId != _incidentId1)
.Select(i => i.incident_customer_accounts)
.Where(a => a.AccountId != _accountId2)
.Select(a => a.account_primary_contact)
.OrderBy(c => c.FirstName)
.Select(c => c.ContactId);
foreach (var c in query_multiselect)
{
System.Console.WriteLine(c.GetValueOrDefault());
}
}
- Select Many
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_selectmany = svcContext.ContactSet
.Where(c => c.ContactId != _contactId2)
.SelectMany(c => c.account_primary_contact)
.OrderBy(a => a.Name);
foreach (var c in query_selectmany)
{
System.Console.WriteLine(c.AccountId + " " + c.Name);
}
}
- String Operation
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_string = from c in svcContext.ContactSet
where c.ContactId == _contactId2
select new
{
IndexOf = c.FirstName.IndexOf("contact"),
Insert = c.FirstName.Insert(1, "Insert"),
Remove = c.FirstName.Remove(1, 1),
Substring = c.FirstName.Substring(1, 1),
ToUpper = c.FirstName.ToUpper(),
ToLower = c.FirstName.ToLower(),
TrimStart = c.FirstName.TrimStart(),
TrimEnd = c.FirstName.TrimEnd(),
};
foreach (var c in query_string)
{
System.Console.WriteLine(c.IndexOf + "\n" + c.Insert + "\n" +
c.Remove + "\n" + c.Substring + "\n"
+ c.ToUpper + "\n" + c.ToLower +
"\n" + c.TrimStart + " " + c.TrimEnd);
}
}
- Two Where Clauses
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_twowhere = from a in svcContext.AccountSet
join c in svcContext.ContactSet
on a.PrimaryContactId.Id equals c.ContactId
where c.LastName == "Smith" && c.CreditOnHold != null
where a.Name == "Contoso Ltd"
orderby a.Name
select a;
foreach (var c in query_twowhere)
{
System.Console.WriteLine(c.AccountId + " " + c.Name);
}
}
- Load Property to Retrieve Related Products
Contact benAndrews = svcContext.ContactSet.Where(c => c.FullName == "Ben Andrews").FirstOrDefault();
if (benAndrews != null)
{
//benAndrews.Contact_Tasks is null until LoadProperty is used.
svcContext.LoadProperty(benAndrews, "Contact_Tasks");
Task benAndrewsFirstTask = benAndrews.Contact_Tasks.FirstOrDefault();
if (benAndrewsFirstTask != null)
{
Console.WriteLine("Ben Andrews first task with Subject: '{0}' retrieved.", benAndrewsFirstTask.Subject);
}
}
Stay tuned.
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