/// <summary>
/// 拼接两个 <paramref>
/// <name>System.Linq.Expression</name>
/// </paramref>
/// ，两个 <paramref>
/// <name>System.Linq.Expression</name>
/// </paramref>
/// 的参数必须完全相同。
/// </summary>
/// <param name="left">左边的 <paramref>
/// <name>System.Linq.Expression</name>
/// </paramref>
/// </param>
/// <param name="right">右边的 <paramref>
/// <name>System.Linq.Expression</name>
/// </paramref>
/// </param>
/// <param name="func">表达式拼接的具体逻辑</param>
/// <returns>拼接完成的 <paramref>
/// <name>System.Linq.Expression</name>
/// </paramref>
/// </returns>
public static LambdaExpression MakeBinary(this LambdaExpression left, LambdaExpression right, Func <Expression, Expression, Expression> func)
{
if (right?.Body == null)
{
throw new ArgumentNullException(nameof(right));
}
var data = Combinate(right.Parameters, left.Parameters).ToArray();
right = ParameterReplace.Replace(right, data) as LambdaExpression;
return(Expression.Lambda(func(left.Body, right.Body), left.Parameters.ToArray()));
}
public static Expression Replace(Expression e, IEnumerable <KeyValuePair <ParameterExpression, ParameterExpression> > paramList)
{
var item = new ParameterReplace(paramList);
return(item.Visit(e));
}