npm install -g grunt cli

npm install bower -g

define([module-name?],[array-of-dependencies?],[module-factory-or-object])

Expression<Func<int,int,int> expression = (a,b) => a*b +2;

static void Main(string[] args)
{
    ParameterExpression paraLeft = Expression.Parameter(typeof(int), "a");
    ParameterExpression paraRight = Expression.Parameter(typeof(int), "b");

    BinaryExpression binaryLeft = Expression.Multiply(paraLeft, paraRight);
    ConstantExpression conRight = Expression.Constant(2, typeof(int));

    BinaryExpression binaryBody = Expression.Add(binaryLeft, conRight);

    LambdaExpression lambda = 
        Expression.Lambda<Func<int, int, int>>(binaryBody, paraLeft, paraRight);

    Console.WriteLine(lambda.ToString());

    Console.Read();
}

static void Main(string[] args)
{
    Func<int, int, int> lambda = (a, b) => a + b * 2;

    Expression<Func<int, int, int>> expression = (a, b) => a + b * 2;
}

.method private hidebysig static void  Main(string[] args) cil managed
{
  .entrypoint
  .maxstack  3
  .locals init ([0] class [System.Core]System.Func`3<int32,int32,int32> lambda)
  IL_0000:  nop
  IL_0001:  ldsfld     class [System.Core]System.Func`3<int32,int32,int32> 
                        TerryLee.LinqToLiveSearch.Program::'CS$<>9__CachedAnonymousMethodDelegate1'
  IL_0006:  brtrue.s   IL_001b
  IL_0008:  ldnull
  IL_0009:  ldftn      int32 TerryLee.LinqToLiveSearch.Program::'<Main>b__0'(int32,
                                                                             int32)
  IL_000f:  newobj     instance void class [System.Core]System.Func`3<int32,int32,int32>::.ctor(object,
                                                                                                native int)
  IL_0014:  stsfld     class [System.Core]System.Func`3<int32,int32,int32> 
                    TerryLee.LinqToLiveSearch.Program::'CS$<>9__CachedAnonymousMethodDelegate1'
  IL_0019:  br.s       IL_001b
  IL_001b:  ldsfld     class [System.Core]System.Func`3<int32,int32,int32> 
                    TerryLee.LinqToLiveSearch.Program::'CS$<>9__CachedAnonymousMethodDelegate1'
  IL_0020:  stloc.0
  IL_0021:  ret
}

.method private hidebysig static void  Main(string[] args) cil managed
{
  .entrypoint
  .maxstack  4
  .locals init ([0] class [System.Core]System.Linq.Expressions.Expression`1<
                class [System.Core]System.Func`3<int32,int32,int32>> expression,
           [1] class [System.Core]System.Linq.Expressions.ParameterExpression CS$0$0000,
           [2] class [System.Core]System.Linq.Expressions.ParameterExpression CS$0$0001,
           [3] class [System.Core]System.Linq.Expressions.ParameterExpression[] CS$0$0002)
  IL_0000:  nop
  IL_0001:  ldtoken    [mscorlib]System.Int32
  IL_0006:  call       class [mscorlib]System.Type [mscorlib]System.Type::GetTypeFromHandle(...)
  IL_000b:  ldstr      "a"
  IL_0010:  call       class [System.Core]System.Linq.Expressions.ParameterExpression 
                        [System.Core]System.Linq.Expressions.Expression::Parameter(
                        class [mscorlib]System.Type,

  IL_0038:  call    class [mscorlib]System.Type [mscorlib]System.Type::GetTypeFromHandle()
  IL_003d:  call    class [System.Core]System.Linq.Expressions.ConstantExpression 
                    [System.Core]System.Linq.Expressions.Expression::Constant(object,
                    class [mscorlib]System.Type)
  IL_0042:  call    class [System.Core]System.Linq.Expressions.BinaryExpression 
                    [System.Core]System.Linq.Expressions.Expression::Multiply(class [System.Core]System.Linq.Expressions.Expression,
                    class [System.Core]System.Linq.Expressions.Expression)
  IL_0047:  call    class [System.Core]System.Linq.Expressions.BinaryExpression
                    [System.Core]System.Linq.Expressions.Expression::Add(class [System.Core]System.Linq.Expressions.Expression,
                    class [System.Core]System.Linq.Expressions.Expression)
  IL_004c:  ldc.i4.2
  IL_004d:  newarr     [System.Core]System.Linq.Expressions.ParameterExpression
}

static void Main(string[] args)
{
    ParameterExpression paraLeft = Expression.Parameter(typeof(int), "a");
    ParameterExpression paraRight = Expression.Parameter(typeof(int), "b");

    BinaryExpression binaryLeft = Expression.Multiply(paraLeft, paraRight);
    ConstantExpression conRight = Expression.Constant(2, typeof(int));

    BinaryExpression binaryBody = Expression.Add(binaryLeft, conRight);

    Expression<Func<int, int, int>> lambda = 
        Expression.Lambda<Func<int, int, int>>(binaryBody, paraLeft, paraRight);

    Func<int, int, int> myLambda = lambda.Compile();

    int result = myLambda(2, 3);
    Console.WriteLine("result:" + result.ToString());

    Console.Read();
}

static void Main(string[] args)
{
    BinaryExpression body = Expression.Add(
        Expression.Constant(2),
        Expression.Constant(3));

    Expression<Func<int>> expression = 
        Expression.Lambda<Func<int>>(body, null);

    Func<int> lambda = expression.Compile();

    Console.WriteLine(lambda());
}

static void Main(string[] args)
{
    Expression<Func<int, int, int>> lambda = (a, b) => a + b * 2;

    Console.WriteLine(lambda.ToString());
}

public class OperationsVisitor : ExpressionVisitor
{
    public Expression Modify(Expression expression)
    {
        return Visit(expression);
    }

    protected override Expression VisitBinary(BinaryExpression b)
    {
        if (b.NodeType == ExpressionType.Add)
        {
            Expression left = this.Visit(b.Left);
            Expression right = this.Visit(b.Right);
            return Expression.Subtract(left,right);
        }

        return base.VisitBinary(b);
    }
}

static void Main(string[] args)
{
    Expression<Func<int, int, int>> lambda = (a, b) => a + b * 2;

    var operationsVisitor = new OperationsVisitor();
    Expression modifyExpression = operationsVisitor.Modify(lambda);

    Console.WriteLine(modifyExpression.ToString());
}

static void Main(string[] args)
{
    List<String> myList = new List<String>() { "a", "ab", "cd", "bd" };

    IEnumerable<String> query = from s in myList
                where s.StartsWith("a")
                select s;

    foreach (String s in query)
    {
        Console.WriteLine(s);
    }

    Console.Read();
}

public interface IEnumerable<T>:Ienumerable
{
    IEnumerator<T> GetEnumerator();
}

public static class Enumerable
{
    public static IEnumerable<TSource> Where<TSource>(
        this IEnumerable<TSource> source, 
        Func<TSource, bool> predicate)
    {
        if (source == null)
        {
            throw Error.ArgumentNull("source");
        }
        if (predicate == null)
        {
            throw Error.ArgumentNull("predicate");
        }
        return WhereIterator<TSource>(source, predicate);
    }

    public static IEnumerable<TSource> Where<TSource>(
        this IEnumerable<TSource> source, 
        Func<TSource, int, bool> predicate)
    {
        if (source == null)
        {
            throw Error.ArgumentNull("source");
        }
        if (predicate == null)
        {
            throw Error.ArgumentNull("predicate");
        }
        return WhereIterator<TSource>(source, predicate);
    }
}

static void Main(string[] args)
{
    var myList = new List<String>() 
                { "a", "ab", "cd", "bd" }.AsQueryable<String>();

    IQueryable<String> query = from s in myList
                where s.StartsWith("a")
                select s;

    foreach (String s in query)
    {
        Console.WriteLine(s);
    }

    Console.Read();
}

public static class Queryable
{
    public static IQueryable<TSource> Where<TSource>(this IQueryable<TSource> source, 
            Expression<Func<TSource, bool>> predicate)
    {
        if (source == null)
        {
            throw Error.ArgumentNull("source");
        }
        if (predicate == null)
        {
            throw Error.ArgumentNull("predicate");
        }
        return source.Provider.CreateQuery<TSource>(
            Expression.Call(null, ((MethodInfo) MethodBase.GetCurrentMethod())
            .MakeGenericMethod(new Type[] { typeof(TSource) }), 
            new Expression[] { source.Expression, Expression.Quote(predicate) }));
    }

    public static IQueryable<TSource> Where<TSource>(this IQueryable<TSource> source,
        Expression<Func<TSource, int, bool>> predicate)
    {
        if (source == null)
        {
            throw Error.ArgumentNull("source");
        }
        if (predicate == null)
        {
            throw Error.ArgumentNull("predicate");
        }
        return source.Provider.CreateQuery<TSource>(
            Expression.Call(null, ((MethodInfo) MethodBase.GetCurrentMethod())
            .MakeGenericMethod(new Type[] { typeof(TSource) }), 
            new Expression[] { source.Expression, Expression.Quote(predicate) }));
    }
}

public class MyData<T> : IEnumerable<T>
                where T : class
{
    public IEnumerator<T> GetEnumerator()
    {
        return null;
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
        return null;
    }

    // 其它成员
}

public class QueryableData<TData> : IQueryable<TData>
{
    public QueryableData()
    {
        Provider = new TerryQueryProvider();
        Expression = Expression.Constant(this);
    }

    public QueryableData(TerryQueryProvider provider, 
        Expression expression)
    {
        if (provider == null)
        {
            throw new ArgumentNullException("provider");
        }

        if (expression == null)
        {
            throw new ArgumentNullException("expression");
        }

        if (!typeof(IQueryable<TData>).IsAssignableFrom(expression.Type))
        {
            throw new ArgumentOutOfRangeException("expression");
        }

        Provider = provider;
        Expression = expression;
    }

    public IQueryProvider Provider { get; private set; }
    public Expression Expression { get; private set; }

    public Type ElementType
    {
        get { return typeof(TData); }
    }

    public IEnumerator<TData> GetEnumerator()
    {
        return (Provider.Execute<IEnumerable<TData>>(Expression)).GetEnumerator();
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
        return (Provider.Execute<IEnumerable>(Expression)).GetEnumerator();
    }
}

public class TerryQueryProvider : IQueryProvider
{
    public IQueryable CreateQuery(Expression expression)
    {
        Type elementType = TypeSystem.GetElementType(expression.Type);
        try
        {
            return (IQueryable)Activator.CreateInstance(
                typeof(QueryableData<>).MakeGenericType(elementType),
                new object[] { this, expression });
        }
        catch
        {
            throw new Exception();
        }
    }

    public IQueryable<TResult> CreateQuery<TResult>(Expression expression)
    {
        return new QueryableData<TResult>(this, expression);
    }

    public object Execute(Expression expression)
    {
        // ......
    }

    public TResult Execute<TResult>(Expression expression)
    {
        // ......
    }
}

static void Main(string[] args)
{
    QueryableData<String> mydata = new QueryableData<String> { 
        "TerryLee",
        "Cnblogs",
        "Dingxue"
    };

    var result = from d in mydata
                 select d;
    foreach (String item in result)
    {
        Console.WriteLine(item);
    }
}