Mikel
来源： .net 动态加载Dll – icyjiang – 博客园
在程序正在使用的过程中，常常需要升级DLL。这时，如果dll已经被主程序引用，则无法修改，这样的需求应该很常见。换个角度，可以理解成程序的升级或者修改Bug的功能。
以下通过动态的加载Dll来解决这个问题。
整个思路的前提是，动态调用的东西和前台需要的功能通过代理IBaseInterface连接起来，也就是说动态dll里面的类和Proxy都需要实现这个接口。
<span class="pln"></span><span class="kwd">namespace</span><span class="pln"> </span><span class="typ">BaseInterface</span><span class="pln"></span><span class="pun">{</span><span class="pln"></span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">interface</span><span class="pln"> </span><span class="typ">IBaseInterface</span><span class="pln"></span><span class="pun">{</span><span class="pln"></span><span class="kwd">string</span><span class="pln"> </span><span class="typ">GetString</span><span class="pun">();</span><span class="pln"></span><span class="pun">}</span><span class="pln"></span><span class="pun">}</span><span class="pln"></span> |
核心代码：Proxy.dll
<span class="tag"><pre></span><span class="pln">namespace Proxy{ internal class AppDomainCore { public AppDomain DefaultAppDomain { get; private set; } public string DefaultAppDomainName { get; private set; } public AppDomainCore(string appDomainName) { DefaultAppDomainName = appDomainName; AppDomainSetup setup = new AppDomainSetup(); setup.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory; setup.ConfigurationFile = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile; Evidence evidence = new Evidence(AppDomain.CurrentDomain.Evidence); DefaultAppDomain = AppDomain.CreateDomain(appDomainName, evidence, setup); } public bool ClearAppDomain() { try { AppDomain.Unload(DefaultAppDomain); DefaultAppDomain = null; return true; } catch { return false; } } ~AppDomainCore() { ClearAppDomain(); } }}</span><span class="tag"></pre></span><span class="pln"></span><span class="tag"><div</span><span class="pln"> </span><span class="atn">class</span><span class="pun">=</span><span class="atv">"cnblogs_code_toolbar"</span><span class="tag">><span</span><span class="pln"> </span><span class="atn">class</span><span class="pun">=</span><span class="atv">"cnblogs_code_copy"</span><span class="tag">><a</span><span class="pln"> </span><span class="atn">title</span><span class="pun">=</span><span class="atv">"复制代码"</span><span class="tag">><img</span><span class="pln"> </span><span class="atn">src</span><span class="pun">=</span><span class="atv">"http://www.mikel.cn/wp-content/uploads/2015/05/copycode30.gif"</span><span class="pln"> </span><span class="atn">alt</span><span class="pun">=</span><span class="atv">"复制代码"</span><span class="pln"> </span><span class="atn">data-bd-imgshare-binded</span><span class="pun">=</span><span class="atv">"1"</span><span class="pln"> </span><span class="tag">/></a></span></span><span class="pln">namespace Proxy{internal class AssemblyCore{public string ActivedAssemblyName { get; private set; }public string CurrentType { get; private set; }public FileInfo DefaultAssemblyFile { get; private set; }public AssemblyCore(string assemblyName, string type){ActivedAssemblyName = assemblyName;CurrentType = type;try{DefaultAssemblyFile = new FileInfo(assemblyName);}catch (Exception ex){MessageBox.Show(ex.Message);}}}}</span><span class="tag"></div></span><span class="pln"></span><span class="tag"><div</span><span class="pln"> </span><span class="atn">class</span><span class="pun">=</span><span class="atv">"cnblogs_code_toolbar"</span><span class="tag">></div></span><span class="pln"></span><span class="tag"><div</span><span class="pln"> </span><span class="atn">class</span><span class="pun">=</span><span class="atv">"cnblogs_code_toolbar"</span><span class="tag">></span><span class="pln">namespace Proxy{public class Proxy : BaseInterface.IBaseInterface{AssemblyCore _assemblyCore;AppDomainCore _appDomainCore;public string DefaultAssemblyName { get { return _assemblyCore.ActivedAssemblyName; } }public string DefaultAppDomainName { get { return _appDomainCore.DefaultAppDomainName; } }public Proxy(string assemblyName, string typeName, string appDomainName){_assemblyCore = new AssemblyCore(assemblyName, typeName);_appDomainCore = new AppDomainCore(appDomainName);}public void UnLoad(){_appDomainCore.ClearAppDomain();}BaseInterface.IBaseInterface _proxy;public string GetString(){if (_proxy == null)_proxy = _appDomainCore.DefaultAppDomain.CreateInstanceFromAndUnwrap(_assemblyCore.ActivedAssemblyName, _assemblyCore.CurrentType)as BaseInterface.IBaseInterface;return _proxy.GetString();}}}</span><span class="tag"></div></span><span class="pln"></span><span class="tag"><div</span><span class="pln"> </span><span class="atn">class</span><span class="pun">=</span><span class="atv">"cnblogs_code_toolbar"</span><span class="tag">></span> |
