For input string: "null1"

"For input string: 'null1'"错误的原因是对字符串进行数字格式化时，将字符串'null1'转换为整数时出错。这种错误通常发生在尝试将非数字字符串转换为数字类型时。在这种情况下，'null1'不是一个有效的数字字符串，因此无法转换为整数。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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