HashSet as DataSource

Question

我正在尝试优化SharePoint webpart的代码。我有一个中继器控制：

<asp:Repeater ID="CountryOptionsRepeater" runat="server"> 
    <ItemTemplate> 
     <option value='<%#Eval("CountryName") %>'><%#Eval("CountryName") %></option> 
    </ItemTemplate> 
</asp:Repeater> 

我正在与数据表

countriesList = countriesList.Distinct<String>().ToList<String>(); 
countriesList.Sort(); 
//var noDupsCountriesList = new HashSet<String>(countriesList); 

DataTable dt = new DataTable(); 
dt.Columns.Add("CountryName"); 

foreach (String countryName in countriesList) 
{ 
    DataRow dr = dt.NewRow(); 
    dr["CountryName"] = countryName; 
    dt.Rows.Add(dr); 
} 

CountryOptionsRepeater.DataSource = dt; 
CountryOptionsRepeater.DataBind(); 
this.DataBind(); 

填充它是否有HashSet对象（noDupsCountriesList）直接结合至与中继器的相同的配置数据源的方式，为了带来优化？

喜欢的东西：

//countriesList = countriesList.Distinct<String>().ToList<String>(); 
//countriesList.Sort(); 
var noDupsCountriesList = new HashSet<String>(countriesList); 

CountryOptionsRepeater.DataMember = "CountryName"; // ?? 
CountryOptionsRepeater.DataSource = noDupsCountriesList; 
CountryOptionsRepeater.DataBind(); 
this.DataBind(); 

Answer 1

我觉得这条线可以取代你的代码的第二块：

CountryOptionsRepeater.DataSource = 
    countriesList 
    .Distinct() 
    .OrderBy(c => c) 
    .Select(c => new { CountryName = c }) 
    .ToList();