public static void EnsureColumnType <T>(DataRow dr, int rowindex, string columnname)
{
string colvalue = dr[columnname].ToString();
Type targetType = typeof(T);
if (colvalue.Length == 0 && ValidationUtils.IsTheTargetTypeAValueTypeDifferentFromString(targetType))
{
throw new Exception(string.Format("第[{0}]行的数据列'{1}'的值'{2}'不能转换为{3}", rowindex, columnname, colvalue, targetType));
}
object convertedValue = null;
try
{
TypeConverter typeConverter = TypeDescriptor.GetConverter(targetType);
convertedValue = typeConverter.ConvertFromString(null, CultureInfo.CurrentCulture, colvalue);
}
catch
{
}
string typename;
if (targetType == typeof(int))
{
typename = "整数";
}
else if (targetType == typeof(bool))
{
typename = "真假值";
}
else if (targetType == typeof(decimal))
{
typename = "小数";
}
else if (targetType == typeof(DateTime))
{
typename = "时间";
}
else
{
typename = targetType.ToString();
}
if (convertedValue == null)
{
throw new Exception(string.Format("第[{0}]行的数据列'{1}'的值'{2}'不能转换为{3}", rowindex, columnname, colvalue, typename));
}
}