如何在C#中将谓词传递给函数？

public void InitializeStatusList(DropDownList list)
    {
       var dictionaryEntries = GetEntriesFromDatabase();
       list.DataSource = dictionaryEntries.Where(entry => entry is EntryStatus1 || entry is EntryStatus2);
       list.DataBind();           
    }

我有很多这样的功能.我想用translateEntries作为谓词传递的查询条件编写公共函数.

例如：

public void InitializeStatusList(DropDownList list)
{
    CommonInitializeStatusList(DropDownList list,entry => entry is EntryStatus1 || entry is EntryStatus2);
}

public void CommonInitializeStatusList(DropDownList list,??????????????? predicate)
{                       
    var dictionaryEntries = GetEntriesFromDatabase();
    list.DataSource = dictionaryEntries.Where(predicate);
    list.DataBind();        
}

什么代表???????????????

提前致谢