判断是否是数字
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/// <summary>
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/// 判断是否是数字
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/// </summary>
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/// <param name="str">字符串</param>
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/// <returns></returns>
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private bool IsNumeric(string str)
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{
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if (str == null || str.Length == 0)
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return false;
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System.Text.ASCIIEncoding ascii = new System.Text.ASCIIEncoding();
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byte[] bytestr = ascii.GetBytes(str);
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foreach (byte c in bytestr)
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{
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if (c < 48 || c > 57)
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{
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return false;
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}
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}
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return true;
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}
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