C＃lambda表达式可以有多个语句吗？

List<String> items = new List<string>();

var results = items.Where(i => 
       {
                bool result;

                if (i == \"THIS\")
                    result = true;
                else if (i == \"THAT\")
                    result = true;
                else
                    result = false;

                return result;
            }
        );

// Valid
Func<int, int> a = x => x + 1;
Func<int, int> b = x => { return x + 1; };        
Expression<Func<int, int>> c = x => x + 1;

// Invalid
Expression<Func<int, int>> d = x => { return x + 1; };

int expr(int x, int y) => x + y + 1; 

int expr(int x, int y) { int z = 8; return x + y + z + 1; };

Func<int, int, int> a = (x, y) => x + y + 1;

Func<int, int, int> b = (x, y) => { int z = 8; return x + y + z + 1; };

Func<string, bool> test = (name) => 
{
   if (name == \"yes\") return true;
   else return false;
}

Public string ParentMethod(int i, int x){
    int calculation = (i*x);
    (string info, int result) InternalTuppleMethod(param1, param2)
    {
        var sum = (calculation + 5);
        return (\"The calculation is\", sum);
    }
}

    public class Point
    {
        public int X { get; set; }
        public int Y { get; set; }
    }

Action<int, int> action = (x, y) => (_, _) = (X += x, Y += y);

Action<int, int> action = (x, y) => _ = (X += x, Y += y);

Action<int, int> action = (x, y) => { X += x; Y += y; };

public void Action(int x, int y) => (_, _) = (X += x, Y += y);

public void Action(int x, int y) => _ = (X += x, Y += y);

public void Action(int x, int y) => (X, Y) = (X + x, Y + y);