Question

我想要app.Config中配置部分中存储的load int值。这是我的app.Config文件：

 <?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
    </startup>
  <configSections>
    <section name="MySection" type="ConsoleApplication2.MySectionSection, ConsoleApplication2" />
  </configSections>
  <MySection>
    <Add key="DefaultCapacity" value="15"/>
  </MySection>
</configuration>

这是我的配置部分类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication2
{
    public sealed class MySection
    {

        private static MySectionSection _config;

        static MySection()
        {
            _config = ((MySectionSection)(global::System.Configuration.ConfigurationManager.GetSection("MySection")));
        }

        private MySection()
        {
        }

        public static MySectionSection Config
        {
            get
            {
                return _config;
            }
        }
    }

    public sealed partial class MySectionSection : System.Configuration.ConfigurationSection
    {

        [System.Configuration.ConfigurationPropertyAttribute("Add")]
        public AddElement Add
        {
            get
            {
                return ((AddElement)(this["Add"]));
            }
        }

        public sealed partial class AddElement : System.Configuration.ConfigurationElement
        {

            [System.Configuration.ConfigurationPropertyAttribute("key", IsRequired = true)]
            public string Key
            {
                get
                {
                    return ((string)(this["key"]));
                }
                set
                {
                    this["key"] = value;
                }
            }

            [System.Configuration.ConfigurationPropertyAttribute("value", IsRequired = true)]
            public long Value
            {
                get
                {
                    return ((long)(this["value"]));
                }
                set
                {
                    this["value"] = value;
                }
            }
        }
    }
}

但是当我尝试使用这样的代码来获取我的cofiguration部分时，我得到了异常

System.InvalidCastException。无法允许对象类型键入“System.Configuration.DefaultSection” “ConsoleApplication2.MySectionSection

Configuration cfg = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var mn =(MySectionSection)cfg.GetSection("MySection"); //there is exception

无法从app.config获取配置部分

0 个答案: