PROSAGA码农传奇-区块链扩展技术-InvalidOperationException：找不到策略

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    通过在指向正确方向后仔细查看Microsoft文档，我设法解决了这个问题。
  
  
    <a href="https://github.com/aspnet/Docs/blob/master/aspnetcore/security/authorization/iauthorizationpolicyprovider.md#multiple-authorization-policy-providers" rel="nofollow noreferrer">
      https://github.com/aspnet/Docs/blob/master/aspnetcore/security/authorization/iauthorizationpolicyprovider.md#multiple-authorization-policy-providers
    </A>
  
  <BLOCKQUOTE>
    
      使用自定义IAuthorizationPolicyProvider实现时，请记住ASP.NET Core仅使用IAuthorizationPolicyProvider的一个实例。如果自定义提供程序无法为所有策略名称提供授权策略，则应该回退到备份提供程序。
    
  </BLOCKQUOTE>
  
    结果我改变了我的实施
     <code>
 HasPermissionPolicyProvider
 </code>
     至
     <code>
 CustomPolicyProvider
 </code>
     内容如下：
  
   <pre>
 <code>
 public class CustomPolicyProvider : DefaultAuthorizationPolicyProvider
{
 private const string PermissionPolicyPrefix = "HasPermission";

public CustomPolicyProvider(IOptions<AuthorizationOptions> options) : base(options)
 {
 }

public override async Task<AuthorizationPolicy> GetPolicyAsync(string policyName)
 {
 var policy = await base.GetPolicyAsync(policyName);

if (policy != null) return policy;

if (policyName.StartsWith(PermissionPolicyPrefix, StringComparison.OrdinalIgnoreCase))
        {
            var permission = policyName.Substring(PermissionPolicyPrefix.Length);

return new AuthorizationPolicyBuilder()
                .AddRequirements(new HasPermissionRequirement(permission))
                .Build();
        }

return null;
    }
}

</code>
 </pre>
  
    这意味着您只能拥有一个必须处理所有逻辑的PolicyProvider。如果需要多个处理程序逻辑，则更改是确保它调用默认实现。
  
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