I started getting really tired of looking up the translation between the ExpressionType and concrete Expression type (they don’t match up), so I created this cheat sheet that has each ExpressionType, derived Expression type and a simple example. What’s interesting is a few are only available in VB.NET, but no one really wants non-short-circuited Or/And operators, do they? You can [download the PDF version](http://grabbagoftimg.s3.amazonaws.com/Expression Cheat Sheet.pdf), or just view the big list in all its glory:
ExpressionType
<td width="142">
Type
</td>
<td width="474">
Example
</td>
Add
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 2, j = 3;
Expression <Func <int >> example = () => i + j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
AddChecked
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = <span style="color: #2b91af">Int32</span>.MaxValue, j = 1;
Expression <Func <int >> example = () => checked (i + j);
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
And
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">Dim </span>i <span style="color: blue">As Boolean </span>= <span style="color: blue">True</span>, j <span style="color: blue">As Boolean </span>= <span style="color: blue">False
Dim sample As Expression(Of Func(Of Boolean )) = _
Function () i And j
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
AndAlso
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">bool </span>i = <span style="color: blue">true</span>, j = <span style="color: blue">false</span>;
Expression <Func <bool >> example = () => i && j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
ArrayLength
</td>
<td>
UnaryExpression
</td>
<td>
<pre><span style="color: blue">int</span>[] values = {1, 2, 3};
Expression <Func <int >> example = () => values.Length;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
ArrayIndex
</td>
<td>
MethodCallExpression
</td>
<td>
<pre><span style="color: blue">int</span>[] values = {1, 2, 3};
Expression <Func <int >> example = () => values[1];
<p>
<a href="http://11011.net/software/vspaste"></a><a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Call
</td>
<td>
MethodCallExpression
</td>
<td>
<pre><span style="color: blue">var </span>sample = <span style="color: blue">new </span><span style="color: #2b91af">Sample</span>();
Expression <Func <int >> example =
() => sample.Calc();
<tr>
<td>
Coalesce
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int</span>? i = <span style="color: blue">null</span>, j = 5;
Expression <Func <int ?>> example = () => i ?? j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Conditional
</td>
<td>
ConditionalExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 3, j = 5;
bool k = false ;
Expression <Func <int ?>> example = () => k ? i : j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Constant
</td>
<td>
ConstantExpression
</td>
<td>
<pre><span style="color: #2b91af">Expression</span><<span style="color: #2b91af">Func</span><<span style="color: blue">int</span>>> example = () => 5;</pre>
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Convert
</td>
<td>
UnaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 5;
object j = i;
Expression <Func <int >> example = () => (int ) j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
ConvertChecked
</td>
<td>
UnaryExpression
</td>
<td>
<pre><span style="color: blue">long </span>i = 5;
Expression <Func <int >> example = () => checked ((int )i);
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Divide
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 21, j = 3;
Expression <Func <int >> example = () => i / j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Equal
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 21, j = 3;
Expression <Func <bool >> example = () => i == j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
ExclusiveOr
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 12, j = 7;
Expression <Func <int >> example = () => i ^ j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
GreaterThan
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 12, j = 7;
Expression <Func <bool >> example = () => i > j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
GreaterThanOrEqual
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 12, j = 7;
Expression <Func <bool >> example = () => i >= j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Invoke
</td>
<td>
InvocationExpression
</td>
<td>
<pre><span style="color: #2b91af">Expression</span><<span style="color: #2b91af">Func</span><<span style="color: blue">int</span>, <span style="color: blue">int</span>, <span style="color: blue">int</span>>> expr = (i, j) => i + j;
Expression invoke = Expression .Invoke(
expr,
Expression .Constant(5),
Expression .Constant(4));
Expression <Func <int >> example =
Expression .Lambda<Func <int >>(invoke);
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Lambda
</td>
<td>
LambdaExpression
</td>
<td>
<pre><span style="color: #2b91af">Expression</span><<span style="color: #2b91af">Func</span><<span style="color: blue">int</span>>> example =
<span style="color: #2b91af">Expression</span>.Lambda<<span style="color: #2b91af">Func</span><<span style="color: blue">int</span>>>(<span style="color: #2b91af">Expression</span>.Constant(5));</pre>
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
LeftShift
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 8;
Expression <Func <int >> example = () => i << 1;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
LessThan
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 12, j = 7;
Expression <Func <bool >> example = () => i < j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
LessThanOrEqual
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 12, j = 7;
Expression <Func <bool >> example = () => i <= j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
ListInit
</td>
<td>
ListInitExpression
</td>
<td>
<pre><span style="color: #2b91af">Expression</span><<span style="color: #2b91af">Func</span><<span style="color: #2b91af">List</span><<span style="color: blue">int</span>>>> example =
() => <span style="color: blue">new </span><span style="color: #2b91af">List</span><<span style="color: blue">int</span>> {1, 2, 3};</pre>
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
MemberAccess
</td>
<td>
MemberExpression
</td>
<td>
<pre><span style="color: blue">var </span>c = <span style="color: blue">new </span><span style="color: #2b91af">Customer </span>{Name = <span style="color: #a31515">"Bob"</span>};
Expression <Func <string >> example = () => c.Name;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
MemberInit
</td>
<td>
MemberInitExpression
</td>
<td>
<pre><span style="color: #2b91af">Expression</span><<span style="color: #2b91af">Func</span><<span style="color: #2b91af">Customer</span>>> example =
() => <span style="color: blue">new </span><span style="color: #2b91af">Customer </span>{Name = <span style="color: #a31515">"Bob"</span>};</pre>
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Modulo
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 5, j = 3;
Expression <Func <int >> example = () => i % j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Multiply
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 5, j = 3;
Expression <Func <int >> example = () => i * j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
MultiplyChecked
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 5, j = 3;
Expression <Func <int >> example = () => checked (i * j);
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Negate
</td>
<td>
UnaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 5;
Expression <Func <int >> example = () => -i;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
UnaryPlus
</td>
<td>
UnaryExpression
</td>
<td>
<pre><span style="color: blue">var </span>m = <span style="color: blue">new </span><span style="color: #2b91af">Money </span>{ Amount = -10m };
Expression <Func <Money >> example = () => +m;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
NegateChecked
</td>
<td>
UnaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 5;
Expression <Func <int >> example = () => checked (-i);
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
New
</td>
<td>
NewExpression
</td>
<td>
<pre><span style="color: #2b91af">Expression</span><<span style="color: #2b91af">Func</span><<span style="color: #2b91af">Customer</span>>> example =
() => <span style="color: blue">new </span><span style="color: #2b91af">Customer</span>();</pre>
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
NewArrayInit
</td>
<td>
NewArrayExpression
</td>
<td>
<pre><span style="color: #2b91af">Expression</span><<span style="color: #2b91af">Func</span><<span style="color: blue">int</span>[]>> example =
() => <span style="color: blue">new</span>[] {1, 2, 3};</pre>
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
NewArrayBounds
</td>
<td>
NewArrayExpression
</td>
<td>
<pre><span style="color: #2b91af">Expression</span><<span style="color: #2b91af">Func</span><<span style="color: blue">int</span>[]>> example = () => <span style="color: blue">new int</span>[10];</pre>
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Not
</td>
<td>
UnaryExpression
</td>
<td>
<pre><span style="color: blue">bool </span>val = <span style="color: blue">true</span>;
Expression <Func <bool >> example = () => !val;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
NotEqual
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 4, j = 7;
Expression <Func <bool >> example = () => i != j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Or
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">Dim </span>i <span style="color: blue">As Boolean </span>= <span style="color: blue">True</span>, j <span style="color: blue">As Boolean </span>= <span style="color: blue">False
Dim sample As Expression(Of Func(Of Boolean )) = _
Function () i Or j
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
OrElse
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">bool </span>i = <span style="color: blue">true</span>, j = <span style="color: blue">false</span>;
Expression <Func <bool >> example = () => i || j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Parameter
</td>
<td>
ParameterExpression
</td>
<td>
<pre><span style="color: green">// (i, j) => i + j;
ParameterExpression param1 =
Expression .Parameter(typeof (int ), “i” );
ParameterExpression param2 =
Expression .Parameter(typeof (int ), “j” );
var addExpression = Expression .Add(param1, param2);
var example = Expression .Lambda<Func <int , int , int >>(
addExpression, param1, param2);
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Power
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">Dim </span>i <span style="color: blue">As Integer </span>= 3, j <span style="color: blue">As Integer </span>= 2
Dim sample As Expression(Of Func(Of Integer )) = _
Function () i ^ j
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Quote
</td>
<td>
UnaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 3, j = 2;
Expression <Func <int >> inner = () => i * j;
var quoted = Expression .Quote(inner);
Expression <Func <Expression <Func <int >>>> example =
Expression .Lambda<Func <Expression <Func <int >>>>(quoted);
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
RightShift
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 8;
Expression <Func <int >> example = () => i >> 1;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
Subtract
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 8, j = 5;
Expression <Func <int >> example = () => i - j;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
SubtractChecked
</td>
<td>
BinaryExpression
</td>
<td>
<pre><span style="color: blue">int </span>i = 8, j = 5;
Expression <Func <int >> example = () => checked (i - j);
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
TypeAs
</td>
<td>
UnaryExpression
</td>
<td>
<pre><span style="color: blue">var </span>c = <span style="color: blue">new </span><span style="color: #2b91af">Customer </span>{Name = <span style="color: #a31515">"Bob"</span>};
Expression <Func <Person >> example = () => c as Person ;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr>
<tr>
<td>
TypeIs
</td>
<td>
TypeBinaryExpression
</td>
<td>
<pre><span style="color: blue">var </span>c = <span style="color: blue">new </span><span style="color: #2b91af">Customer </span>{Name = <span style="color: #a31515">"Bob"</span>};
Expression <Func <bool >> example = () => c is int ;
<p>
<a href="http://11011.net/software/vspaste"></a></td> </tr> </tbody> </table>
<p>
This is only for C# 3.0, the .NET 4.0 list should grow quite a bit.
</p>
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