C# 如何使用匿名类型的动态OrderBy变量?
我有几个网站,在主页上加载文章。我可以设置文章的排名,以不同的顺序显示它们,但在不同的网站上,文章的顺序可能会有所不同 我必须订购物品的代码为所有网站设置了相同的订购顺序:C# 如何使用匿名类型的动态OrderBy变量?,c#,linq,dynamic,.net-3.5,C#,Linq,Dynamic,.net 3.5,我有几个网站,在主页上加载文章。我可以设置文章的排名,以不同的顺序显示它们,但在不同的网站上,文章的顺序可能会有所不同 我必须订购物品的代码为所有网站设置了相同的订购顺序: string officeLocation = ""; // office location could be either World, Europe, Africa, America, Asia, Pacific var result = articles.Select(a => new
string officeLocation = "";
// office location could be either World, Europe, Africa, America, Asia, Pacific
var result = articles.Select(a => new
{
Title = a.Title,
Url = a[SPBuiltInFieldId.FileRef],
Byline = a[Constants.FieldNames.Byline],
ArticleDate = a[Constants.FieldNames.ArticleStartDate],
RankWorld = a[Constants.FieldNames.World],
RankEurope = a[Constants.FieldNames.RankEurope],
RankAfrica = a[Constants.FieldNames.RankAfrica],
RankAmerica = a[Constants.FieldNames.RankAmerica],
RankAsia = a[Constants.FieldNames.RankAsia],
RankPacific = a[Constants.FieldNames.RankPacific],
});
rptArticles.DataSource = result.OrderBy(a => a.RankWorld);
rptArticles.DataBind();
该代码将所有排名设置为RankWorld(1-6)的任意值
如果字符串officeLocation
(传递给方法)是Europe,那么我想按a.RankEurope
订购,如果officeLocation是Asia order bya.RankAsia
,依此类推
如何才能最好地实现这一点(.NET 3.5)
提前感谢。假设您有一组固定的位置(根据定义,您必须在匿名类型中声明这些位置),那么您可以使用一个开关:
string officeLocation = "";
// office location could be either World, Europe, Africa, America, Asia, Pacific
var result = articles.Select(a => new
{
Title = a.Title,
Url = a[SPBuiltInFieldId.FileRef],
Byline = a[Constants.FieldNames.Byline],
ArticleDate = a[Constants.FieldNames.ArticleStartDate],
RankWorld = a[Constants.FieldNames.World],
RankEurope = a[Constants.FieldNames.RankEurope],
RankAfrica = a[Constants.FieldNames.RankAfrica],
RankAmerica = a[Constants.FieldNames.RankAmerica],
RankAsia = a[Constants.FieldNames.RankAsia],
RankPacific = a[Constants.FieldNames.RankPacific],
});
switch (officeLocation)
{
case "World": result = result.OrderBy(a => a.RankWorld); break;
case "Europe": result = result.OrderBy(a => a.RankEurope); break;
case "Africa": result = result.OrderBy(a => a.RankAfrica); break;
case "America": result = result.OrderBy(a => a.RankAmerica); break;
case "Asia": result = result.OrderBy(a => a.RankAsia); break;
case "Pacific": result = result.OrderBy(a => a.RankPacific); break;
default: throw new Exception("Unexpected location: " + officeLocation);
}
rptArticles.DataSource = result.OrderBy(a => a.RankWorld);
rptArticles.DataBind();
显然,您需要决定如何最好地处理意外位置
请注意,理想情况下,我会将OrderBy
函数分配给Func
,但只有一个OrderBy
调用,但由于匿名类型,您无法在此处执行此操作