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#region object转成long值，如果不符合条件抛出异常

/// &lt;summary&gt;
        /// object转成long值，如果不符合条件抛出异常
        /// &lt;/summary&gt;
        /// &lt;param name="obj"&gt;&lt;/param&gt;
        /// &lt;returns&gt;&lt;/returns&gt;
        public long LongConvertTo(object obj)
        {
            if (obj is long)
                return (long)obj;

if (obj == null)
                throw new Exception("obj == null");

string str = obj.ToString();

if (str.Length == 0)
                throw new Exception("obj.ToString().Length == 0");

long theResult = long.MinValue;

if (long.TryParse(str, out theResult))
                return theResult;

throw new Exception("obj == " + str + " 不是有效的长整型值。");
        }

#endregion object转成long值，如果不符合条件抛出异常

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