//</snippet14>
static void Main(string[] args)
{
//<snippet1>
var currentPerformanceCounterCategory = new System.Diagnostics.
PerformanceCounterCategory();
//</snippet1>
int val1 = 1;
int val2 = 2;
int val3 = 3;
//<snippet2>
if ((val1 > val2) && (val1 > val3))
{
// Take appropriate action.
}
//</snippet2>
//<snippet3>
// The following declaration creates a query. It does not run
// the query.
//</snippet3>
// Save snippet 4 and 5 for possible additions in program structure.
Name[] nameList = { new Name {
FirstName = "Anderson", LastName = "Redmond"
},
new Name {
FirstName = "Jones", LastName = "Seattle"
},
new Name {
FirstName = "Anderson", LastName = "Redmond"
} };
int n = 0;
//<snippet6>
string displayName = $"{nameList[n].LastName}, {nameList[n].FirstName}";
//</snippet6>
Console.WriteLine("{0}, {1}", nameList[n].LastName, nameList[n].FirstName);
Console.WriteLine(nameList[n].LastName + ", " + nameList[n].FirstName);
//<snippet7>
var phrase = "lalalalalalalalalalalalalalalalalalalalalalalalalalalalalala";
var manyPhrases = new StringBuilder();
for (var i = 0; i < 10000; i++)
{
manyPhrases.Append(phrase);
}
//Console.WriteLine("tra" + manyPhrases);
//</snippet7>
//<snippet8>
// When the type of a variable is clear from the context, use var
// in the declaration.
var var1 = "This is clearly a string.";
var var2 = 27;
var var3 = Convert.ToInt32(Console.ReadLine());
//</snippet8>
//<snippet9>
// When the type of a variable is not clear from the context, use an
// explicit type.
int var4 = ExampleClass.ResultSoFar();
//</snippet9>
//<snippet10>
// Naming the following variable inputInt is misleading.
// It is a string.
var inputInt = Console.ReadLine();
Console.WriteLine(inputInt);
//</snippet10>
//<snippet11>
var syllable = "ha";
var laugh = "";
for (var i = 0; i < 10; i++)
{
laugh += syllable;
Console.WriteLine(laugh);
}
//</snippet11>
//<snippet12>
foreach (var ch in laugh)
{
if (ch == 'h')
{
Console.Write("H");
}
else
{
Console.Write(ch);
}
}
Console.WriteLine();
//</snippet12>
//<snippet13>
// Preferred syntax. Note that you cannot use var here instead of string[].
string[] vowels1 = { "a", "e", "i", "o", "u" };
// If you use explicit instantiation, you can use var.
var vowels2 = new string[] { "a", "e", "i", "o", "u" };
// If you specify an array size, you must initialize the elements one at a time.
var vowels3 = new string[5];
vowels3[0] = "a";
vowels3[1] = "e";
// And so on.
//</snippet13>
//<snippet15>
// In the Main method, create an instance of Del.
// Preferred: Create an instance of Del by using condensed syntax.
Del exampleDel2 = DelMethod;
// The following declaration uses the full syntax.
Del exampleDel1 = new Del(DelMethod);
//</snippet15>
exampleDel1("Hey");
exampleDel2(" hey");
// #16 is below Main.
Console.WriteLine(GetValueFromArray(vowels1, 1));
// 17 requires System.Drawing
//<snippet17>
// This try-finally statement only calls Dispose in the finally block.
Font font1 = new Font("Arial", 10.0f);
try
{
byte charset = font1.GdiCharSet;
}
finally
{
if (font1 != null)
{
((IDisposable)font1).Dispose();
}
}
// You can do the same thing with a using statement.
using (Font font2 = new Font("Arial", 10.0f))
{
byte charset = font2.GdiCharSet;
}
//</snippet17>
//<snippet18>
Console.Write("Enter a dividend: ");
var dividend = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter a divisor: ");
var divisor = Convert.ToInt32(Console.ReadLine());
// If the divisor is 0, the second clause in the following condition
// causes a run-time error. The && operator short circuits when the
// first expression is false. That is, it does not evaluate the
// second expression. The & operator evaluates both, and causes
// a run-time error when divisor is 0.
if ((divisor != 0) && (dividend / divisor > 0))
{
Console.WriteLine("Quotient: {0}", dividend / divisor);
}
else
{
Console.WriteLine("Attempted division by 0 ends up here.");
}
//</snippet18>
//<snippet19>
var instance1 = new ExampleClass();
//</snippet19>
//<snippet20>
ExampleClass instance2 = new ExampleClass();
//</snippet20>
//<snippet21>
// Object initializer.
var instance3 = new ExampleClass {
Name = "Desktop", ID = 37414,
Location = "Redmond", Age = 2.3
};
// Default constructor and assignment statements.
var instance4 = new ExampleClass();
instance4.Name = "Desktop";
instance4.ID = 37414;
instance4.Location = "Redmond";
instance4.Age = 2.3;
//</snippet21>
// #22 and #23 are in Coding_Conventions_WF, below.
// Save 24 in case we add an exxample to Static Members.
ExampleClass.totalInstances = 1;
var customers = new List <Customer>
{
new Customer {
Name = "Jones", ID = 432, City = "Redmond"
}
};
// Check shop name to use this.
var distributors = new List <Distributor>
{
new Distributor {
Name = "ShopSmart", ID = 11302, City = "Redmond"
}
};
//<snippet25>
//<snippet28>
var seattleCustomers = from customer in customers
//</snippet28>
where customer.City == "Seattle"
select customer.Name;
//</snippet25>
//<snippet26>
var localDistributors =
from customer in customers
join distributor in distributors on customer.City equals distributor.City
select new { Customer = customer, Distributor = distributor };
//</snippet26>
//<snippet27>
var localDistributors2 =
from customer in customers
join distributor in distributors on customer.City equals distributor.City
select new { CustomerName = customer.Name, DistributorID = distributor.ID };
//</snippet27>
//<snippet29>
var seattleCustomers2 = from customer in customers
where customer.City == "Seattle"
orderby customer.Name
select customer;
//</snippet29>
// #30 is in class CompoundFrom
var customerDistributorNames =
from customer in customers
join distributor in distributors on customer.City equals distributor.City
select new { CustomerName = customer.Name, DistributorID = distributor.ID };
var customerDistributorNames2 =
from customer in customers
from distributor in distributors
where customer.City == distributor.City
select new { CustomerName = customer.Name, DistributorID = distributor.ID };
foreach (var c in customerDistributorNames)
{
Console.WriteLine(c);
}
// Could use in Static Members.
Console.WriteLine(BaseClass.IncrementTotal());
// Do not do access the static member of the base class through
// a derived class.
Console.WriteLine(DerivedClass.IncrementTotal());
//// Error
//var instance = new ExampleClass();
//Console.WriteLine(instance.IncrementTotal());
}
//</snippet14b>
static void Main(string[] args)
{
//<snippet1>
var currentPerformanceCounterCategory = new System.Diagnostics.
PerformanceCounterCategory();
//</snippet1>
int val1 = 1;
int val2 = 2;
int val3 = 3;
//<snippet2>
if ((val1 > val2) && (val1 > val3))
{
// Take appropriate action.
}
//</snippet2>
//<snippet3>
// The following declaration creates a query. It does not run
// the query.
//</snippet3>
// Save snippet 4 and 5 for possible additions in program structure.
Name[] nameList = { new Name {
FirstName = "Anderson", LastName = "Redmond"
},
new Name {
FirstName = "Jones", LastName = "Seattle"
},
new Name {
FirstName = "Anderson", LastName = "Redmond"
} };
int n = 0;
//<snippet6>
string displayName = $"{nameList[n].LastName}, {nameList[n].FirstName}";
//</snippet6>
Console.WriteLine("{0}, {1}", nameList[n].LastName, nameList[n].FirstName);
Console.WriteLine(nameList[n].LastName + ", " + nameList[n].FirstName);
//<snippet7>
var phrase = "lalalalalalalalalalalalalalalalalalalalalalalalalalalalalala";
var manyPhrases = new StringBuilder();
for (var i = 0; i < 10000; i++)
{
manyPhrases.Append(phrase);
}
//Console.WriteLine("tra" + manyPhrases);
//</snippet7>
//<snippet8>
var var1 = "This is clearly a string.";
var var2 = 27;
//</snippet8>
//<snippet9>
int var3 = Convert.ToInt32(Console.ReadLine());
int var4 = ExampleClass.ResultSoFar();
//</snippet9>
//<snippet10>
var inputInt = Console.ReadLine();
Console.WriteLine(inputInt);
//</snippet10>
//<snippet11>
var syllable = "ha";
var laugh = "";
for (var i = 0; i < 10; i++)
{
laugh += syllable;
Console.WriteLine(laugh);
}
//</snippet11>
//<snippet12>
foreach (char ch in laugh)
{
if (ch == 'h')
{
Console.Write("H");
}
else
{
Console.Write(ch);
}
}
Console.WriteLine();
//</snippet12>
//<snippet13a>
string[] vowels1 = { "a", "e", "i", "o", "u" };
//</snippet13a>
//<snippet13b>
var vowels2 = new string[] { "a", "e", "i", "o", "u" };
//</snippet13b>
//<snippet13c>
var vowels3 = new string[5];
vowels3[0] = "a";
vowels3[1] = "e";
// And so on.
//</snippet13c>
//<snippet15a>
ActionExample1("string for x");
ActionExample2("string for x", "string for y");
Console.WriteLine($"The value is {FuncExample1("1")}");
Console.WriteLine($"The sum is {FuncExample2(1, 2)}");
//</snippet15a>
//<snippet15b>
Del exampleDel2 = DelMethod;
exampleDel2("Hey");
//</snippet15b>
//<snippet15c>
Del exampleDel1 = new Del(DelMethod);
exampleDel1("Hey");
//</snippet15c>
// #16 is below Main.
Console.WriteLine(GetValueFromArray(vowels1, 1));
// 17 requires System.Drawing
//<snippet17a>
Font font1 = new Font("Arial", 10.0f);
try
{
byte charset = font1.GdiCharSet;
}
finally
{
if (font1 != null)
{
((IDisposable)font1).Dispose();
}
}
//</snippet17a>
//<snippet17b>
using (Font font2 = new Font("Arial", 10.0f))
{
byte charset2 = font2.GdiCharSet;
}
//</snippet17b>
//<snippet17c>
using Font font3 = new Font("Arial", 10.0f);
byte charset3 = font3.GdiCharSet;
//</snippet17c>
//<snippet18>
Console.Write("Enter a dividend: ");
int dividend = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter a divisor: ");
int divisor = Convert.ToInt32(Console.ReadLine());
if ((divisor != 0) && (dividend / divisor > 0))
{
Console.WriteLine("Quotient: {0}", dividend / divisor);
}
else
{
Console.WriteLine("Attempted division by 0 ends up here.");
}
//</snippet18>
//<snippet19>
var instance1 = new ExampleClass();
//</snippet19>
// Can't show `ExampleClass instance1 = new()` because this projet targets net48.
//<snippet20>
ExampleClass instance2 = new ExampleClass();
//</snippet20>
//<snippet21a>
var instance3 = new ExampleClass {
Name = "Desktop", ID = 37414,
Location = "Redmond", Age = 2.3
};
//</snippet21a>
//<snippet21b>
var instance4 = new ExampleClass();
instance4.Name = "Desktop";
instance4.ID = 37414;
instance4.Location = "Redmond";
instance4.Age = 2.3;
//</snippet21b>
// #22 and #23 are in Coding_Conventions_WF, below.
// Save 24 in case we add an example to Static Members.
ExampleClass.totalInstances = 1;
var customers = new List <Customer>
{
new Customer {
Name = "Jones", ID = 432, City = "Redmond"
}
};
// Check shop name to use this.
var distributors = new List <Distributor>
{
new Distributor {
Name = "ShopSmart", ID = 11302, City = "Redmond"
}
};
//<snippet25>
//<snippet28>
var seattleCustomers = from customer in customers
//</snippet28>
where customer.City == "Seattle"
select customer.Name;
//</snippet25>
//<snippet26>
var localDistributors =
from customer in customers
join distributor in distributors on customer.City equals distributor.City
select new { Customer = customer, Distributor = distributor };
//</snippet26>
//<snippet27>
var localDistributors2 =
from customer in customers
join distributor in distributors on customer.City equals distributor.City
select new { CustomerName = customer.Name, DistributorID = distributor.ID };
//</snippet27>
//<snippet29>
var seattleCustomers2 = from customer in customers
where customer.City == "Seattle"
orderby customer.Name
select customer;
//</snippet29>
// #30 is in class CompoundFrom
var customerDistributorNames =
from customer in customers
join distributor in distributors on customer.City equals distributor.City
select new { CustomerName = customer.Name, DistributorID = distributor.ID };
var customerDistributorNames2 =
from customer in customers
from distributor in distributors
where customer.City == distributor.City
select new { CustomerName = customer.Name, DistributorID = distributor.ID };
foreach (var c in customerDistributorNames)
{
Console.WriteLine(c);
}
// Could use in Static Members.
Console.WriteLine(BaseClass.IncrementTotal());
// Do not do access the static member of the base class through
// a derived class.
Console.WriteLine(DerivedClass.IncrementTotal());
//// Error
//var instance = new ExampleClass();
//Console.WriteLine(instance.IncrementTotal());
}
