/// <summary>
/// 转换UnaryExpression
/// </summary>
/// <param name="expression"></param>w
/// <returns></returns>
protected virtual string ConvertMemberExpression(MemberExpression expression)
{
var memberExpression = expression;
while (true)
{
if (memberExpression == null || memberExpression.Expression == null)
{
break;
}
if (memberExpression.Expression.NodeType == ExpressionType.Parameter)
{
return(ExpressionHelper.ReplaceExpressionParamter(expression.ToString()));
}
if (memberExpression.Expression.NodeType == ExpressionType.MemberAccess)
{
memberExpression = memberExpression.Expression as MemberExpression;
}
else
{
break;
}
}
var name = CreateParamterName();
SetParameter(name, expression.GetExpressionValue());
return(string.Format("@{0}", name));
}
private static NodeBase Resolve(MemberExpression memberExpression, MemberExpression rootExpression = null)
{
rootExpression = rootExpression ?? memberExpression;
switch (memberExpression.Expression.NodeType)
{
case ExpressionType.Parameter:
return(new MemberNode
{
TableName = TableInfo.GetTableName(rootExpression),
FieldName = TableInfo.GetColumnName(rootExpression)
});
case ExpressionType.MemberAccess:
return(Resolve(memberExpression.Expression as MemberExpression, rootExpression));
case ExpressionType.Call:
case ExpressionType.Constant:
return(new ValueNode {
Value = rootExpression.GetExpressionValue()
});
default:
throw new ArgumentException("Expected member expression");
}
}
