正如@svick所建议的，OnActivateAsync是加载晶粒初始状态的最佳方法。

public class ExampleGrain : Orleans.Grain, IExampleGrain
 {

   public override Task OnActivateAsync()
   {
        // set initial state for grain
        return base.OnActivateAsync();
    }

 ...

每次初始化晶粒时都会调用这个方法（不仅仅是第一次）。您可以使用Orleans中内置的持久性基础结构来记录晶粒是否已经在之前创建过（可能使用状态类上的布尔属性），即：

public class ExampleGrainState : GrainState
{
    public bool Initialised { get; set; }
}

[StorageProvider(ProviderName = "Storage")]
public class QuadKeyGrain : Orleans.Grain<ExampleGrainState>, IExampleGrain
{
    public override async Task OnActivateAsync()
    {
        if (!this.State.Initialised)
        {
            // do initialisation 
            this.State.Initialised = true;
            await this.WriteStateAsync();
        }
        await base.OnActivateAsync();
    }

有关持久性的详细信息，请参见本教程：
http://dotnet.github.io/orleans/Tutorials/Declarative-Persistence.html

Grains in Orleans are always exist, so you with your approach are going to [conditionally] re-initialize the grain every time when it gets activated. Is this really what you want to be done?
Well, if you really need to initialize the specific grain to the specific state, then you can use its key (string key or string part of the key) to pass in some json. Just remember that the key has some limitations for its size.