小编Sir*_*our的帖子

考虑我有一个Dictionary<Key,List<item>>TestDictionary

如果我做 :

List<item> someCollection;
TestDictionary.TryGetValue(someKey,out someCollection); //assuming that someCollection will not return null;
someCollection.add(someItem);

将对象someItem添加到Dictionary值TestDictionary [someKey]中的集合中吗？

代码 :

<telerik:RadListView ID="RadListView1" Width="100%" AllowPaging="True" runat="server"
            Skin="Metro" allowsorting="true" ItemPlaceholderID="ProductsHolder" DataKeyNames="Product_ID" GroupPlaceholderID="CategoryHolder"
           GroupItemCount="4" >
            <GroupTemplate>
              <fieldset style="float: left; width: 330px; margin-right: 15px;">
                    <legend><%#Eval("CATEGORY_NAME") %></legend>
                    <table>
                        <tr>
                            <td>
                               <asp:Panel ID="CategoryHolder" runat="server"></asp:Panel>

                            </td>
                        </tr>
                    </table>
                </fieldset>


            </GroupTemplate>

            <LayoutTemplate>
                <fieldset style="width: 100%; margin: 0 auto; border: none;" id="FieldSet1">
                    <telerik:RadDataPager ID="RadDataPager2" runat="server" PagedControlID="RadListView1"
                        Visible='<%# Container.PageCount != 1%>' Skin="Metro" PageSize="52">
                        <Fields>
                            <telerik:RadDataPagerButtonField FieldType="FirstPrev" FirstButtonText="First" PrevButtonText="Prev"
                                HorizontalPosition="LeftFloat" />
                            <telerik:RadDataPagerButtonField FieldType="Numeric" />
                            <telerik:RadDataPagerButtonField FieldType="NextLast" NextButtonText="Next" LastButtonText="Last"
                                HorizontalPosition="RightFloat" />
                        </Fields>
                    </telerik:RadDataPager>
                    <br />
                    <asp:Panel ID="ProductsHolder" runat="server">
                    </asp:Panel>
                    <table …

package main

import "fmt"

func main() {
    blaa := map[string]string{
        "key":    "value",
        getKey(): "value2", //replacing getKey() with "key" results in compile time error.
    }
    fmt.Println("Hello, " + blaa["key"])
}

func getKey() string {
    return "key"
}

运行上面的程序将打印“Hello, value2”。在这里尝试一下https://go.dev/play/p/s92LaaNc3n4

虽然我可以看到密钥被覆盖，但我想知道为什么这panic在运行时不会被覆盖？使用两个字符串文字"key"将导致编译时错误，这是预期的行为。