后台数据库连接时，多次调用造成程序超时报错，错误提醒如下：
“Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.”
“超时过期。从池获取连接之前的超时时间。这可能是因为所有池连接都在使用中，且已达到最大池大小。”
解决方案：
配置连接字符串，配置线程池连接数max pool size=500，扩展连接数。
connectionString=pooling=true;connection lifetime=5;min pool size = 5;max pool size=500;server=***;database=***;User id=***; password=***;MultipleActiveResultSets=True;Enlist=false;Connect Timeout=1500;
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