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您可以通过ObsClient.GetBucketCors查看桶的跨域规则。以下代码展示了如何查看跨域规则：

// 创建ObsClient实例
ObsClient client = new ObsClient("*** Provide your Access Key ***", "*** Provide your Secret Key ***", "https://your-endpoint");
// 查看跨域规则
try
{
    GetBucketCorsConfigurationRequest request = new GetBucketCorsConfigurationRequest();
    request.BucketName = "bucketname";
    GetBucketCorsResponse response = client.GetBucketCors(request);
    foreach (CorsRule rule in response.Configuration.Rules)
    {
        Console.WriteLine("rule id is: {0}\n", rule.Id);
        foreach (string allowOrigin in rule.AllowedOrigins)
        {
            Console.WriteLine("allowOrigin is: {0}\n", allowOrigin);
        }
        foreach (string allowHeader in rule.AllowedHeaders)
        {
            Console.WriteLine("allowHeader is: {0}\n", allowHeader);
        }
        foreach (HttpVerb allowMethod in rule.AllowedMethods)
        {
            Console.WriteLine("allowMethod is: {0}\n", allowMethod);
        }
        foreach (string exposeHeader in rule.ExposeHeaders)
        {
            Console.WriteLine("exposeHeader is: {0}\n", exposeHeader);
        }
        Console.WriteLine("rule maxAgeSeconds is: {0}\n", rule.MaxAgeSeconds);

    }
}
catch (ObsException ex)
{
    Console.WriteLine("ErrorCode: {0}", ex.ErrorCode);
    Console.WriteLine("ErrorMessage: {0}", ex.ErrorMessage);
}