如何将GIFIMAGEVIEW位图保存到外部存储器中

Question

我有两个位图用于imageview，另一个用于GifImageView，我想要做的就是将这两个位图保存到外部存储器。我已将它们保存到外部存储器，但主要问题是GIF无法正常工作。它没有动。有什么帮助吗？

public class LeVisitor<TEntity> : ExpressionVisitor
    where TEntity : class
{
    private readonly int? _take;
    private readonly int? _skip;
    private readonly MethodInfo _queryableSkip;

    public LeVisitor(int? take, int? skip)
    {
        // ...
    }

    protected override Expression VisitMethodCall(MethodCallExpression node)
    {
        return base.VisitMethodCall(AlterTake(AlterSkip(node)));
    }

    private MethodCallExpression AlterTake(MethodCallExpression node)
    {
        if (!_take.HasValue || !node.Method.Name.Equals("Take", StringComparison.Ordinal))
        {
            return node;
        }

        Expression innerCall = node.Arguments[0];
        if (_skip != null)
        {
            var innerMethod = innerCall as MethodCallExpression;
            if (innerMethod != null && !innerMethod.Method.Name.Equals("Skip", StringComparison.Ordinal))
            {
                ConstantExpression skipConstant = Expression.Constant(_skip, typeof(int));
                innerCall = Expression.Call(_queryableSkip, new[] { innerCall, skipConstant });
            }
        }

        return node.Update(
            node.Object,
            new[]
            {
                innerCall,
                Expression.Constant(_take, typeof(int))
            });
    }

    private MethodCallExpression AlterSkip(MethodCallExpression node)
    {
        if (!_skip.HasValue || !node.Method.Name.Equals("Skip", StringComparison.Ordinal))
        {
            return node;
        }

        return node.Update(
            node.Object,
            new[]
            {
                node.Arguments[0],
                Expression.Constant(_skip, typeof(int))
            });
    }
}

gif是GIFIMAGEVIEW，imgtakenpic是ImageView 提前谢谢。