修改ProfileBase的ConnectionString动态(Modifying Profile

我有以下的代码，我想用它来修改ProfileBase的connectionString：

ProfileBase profile = ProfileBase.Create(username);

string _connectionString = (_DataModel.Connection as System.Data.EntityClient.EntityConnection).StoreConnection.ConnectionString;

FieldInfo connectionStringField = profile.Providers["MySqlProfileProvider"].GetType().BaseType.GetField("_sqlConnectionString", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
connectionStringField.SetValue(profile.Providers["MySqlProfileProvider"], _connectionString);

profile["FirstName"] = firstName;
profile["Surname"] = surname;

profile.Save();

首先把connectionStringField总是回来为空，但我可以看到profile.Providers确实包含MySqlProfileProvider 。这是我内指定Web.Config ：

<profile defaultProvider="MySqlProfileProvider">
  <providers>
    <clear/>
    <add name="MySqlProfileProvider" connectionStringName="MyApp" applicationName="MyApp" type="System.Web.Profile.SqlProfileProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>
  </providers>
  <properties>
    <add allowAnonymous="false" defaultValue="" name="FirstName" readOnly="false" serializeAs="String" type="System.String"/>
    <add allowAnonymous="false" defaultValue="" name="Surname" readOnly="false" serializeAs="String" type="System.String"/>
  </properties>
</profile>

我的问题是怎么来的connectionStringField是回来为空？这是否意味着我不能修改连接字符串，就像我通常会用一个自定义MembershipProvider通过重写它的Initialize方法？

你去一个太多的基本类型下：

.Providers["MySqlProfileProvider"].GetType()**.BaseType**.GetField
.Providers["MySqlProfileProvider"].GetType().GetField

下面的代码应该工作：

string _connectionString = (_DataModel.Connection as System.Data.EntityClient.EntityConnection).StoreConnection.ConnectionString;
Type type = profile.Providers["MySqlProfileProvider"].GetType();
FieldInfo connectionStringField = type.GetField("_sqlConnectionString", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
connectionStringField.SetValue(profile.Providers["MySqlProfileProvider"], _connectionString);