/// <summary>
/// 获取支付时使用的Html
/// 交易不存在等错误发生时返回错误信息
/// </summary>
public virtual HtmlString GetPaymentHtml(long transactionId)
{
// 获取交易和支付接口
PaymentTransaction transaction = null;
PaymentApi api = null;
UnitOfWork.ReadData <PaymentTransaction>(r => {
transaction = r.GetById(transactionId);
api = transaction == null ? null : transaction.Api;
var _ = api == null ? null : api.Type; // 在数据库连接关闭前抓取类型
});
// 检查交易和接口是否存在
if (transaction == null)
{
return(BuildErrorHtml(new T("Payment transaction not found")));
}
else if (api == null)
{
return(BuildErrorHtml(new T("Payment api not exist")));
}
// 检查当前登录用户是否可以支付
var result = transaction.Check(c => c.IsPayerLoggedIn);
if (!result.First)
{
return(BuildErrorHtml(result.Second));
}
result = transaction.Check(c => c.IsPayable);
if (!result.First)
{
return(BuildErrorHtml(result.Second));
}
// 调用接口处理器生成支付html
var html = new HtmlString("No Result");
var handlers = api.GetHandlers();
handlers.ForEach(h => h.GetPaymentHtml(transaction, ref html));
return(html);
}