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Gets or sets the length of the longest data bar as a percentage of the cell width.
Use this property to determine or change the maximum visual length applied to data bars in the conditional formatting rule.
int PercentMax { get; set; }
Property PercentMax As Integer
worksheet.Range["A1:A3"].Value = new object[,] {{10}, {30}, {20}};
IDataBar dataBar = worksheet.Range["A1:A3"].FormatConditions.AddDatabar();
dataBar.PercentMax = 80;
int percentMax = dataBar.PercentMax;