public static BlockExpression MergeBlocks(Expression expr1, Expression expr2)
{
IEnumerable <ParameterExpression> variables = new ParameterExpression[0];
IEnumerable <Expression> body = new Expression[0];
if (expr1 is BlockExpression block1)
{
body = body.Concat(block1.Expressions);
variables = variables.Concat(block1.Variables);
}
else
{
body = body.Append(expr1);
}
if (expr2 is BlockExpression block2)
{
body = body.Concat(block2.Expressions);
variables = variables.Concat(block2.Variables);
}
else
{
body = body.Append(expr2);
}
return(Block(variables.Distinct(), body));
}