我可以获取项目中的所有字段（在Sitecore中）吗？

Item.Fields

Sitecore.Context.Item.Fields.ReadAll()

SELECT I2.Name FROM
 Items AS I 
 JOIN UnversionedFields AS UF ON I.ID = UF.ItemId
 JOIN VersionedFields AS V ON I.ID = V.ItemId
 JOIN SharedFields AS S ON I.ID = S.ItemId 
 JOIN Items AS I2 ON I2.ID = UF.FieldId OR I2.ID=V.FieldId OR I2.ID = S.FieldId    
 WHERE I.ID = '110D559F-DEA5-42EA-9C1C-8A5DF7E70EF9'
 GROUP BY I2.Name

// Get Fields directly from the Item
List<string> fieldNames = new List<string>();
item.Fields.ReadAll();
FieldCollection fieldCollection = item.Fields;
foreach (Field field in fieldCollection)
{
    //Use the following check if you do not want 
    //the Sitecore Standard Fields 
    if (!field.Name.StartsWith("__"))
    {
        fieldNames.Add(field.Name);
    }
}