Question

我有一个列表，我想用它来创建一个均匀分布在列中的表所以我会接受：

function_id
exception rpt  
alarm maint    
ratio adder    
temp ratio     
change         
access         
aet sequence   
eng display    
line set       
clear repeaters
enable function
volt setpoint  
feed setpoint  
feed report    
volt report    
problem pot    
temp voltage   
flag pc in/out 
tap enable

并创建以下内容（对格式抱歉）：

Col1--------------Col2--------------Col3--------------Col4--------------Col5--------------Col6

exception rpt   eng display     volt report     ae map          search/starve   amps volts     
alarm maint     line set        problem pot     exception log   votrax watch    search screen  
ratio adder     clear repeaters temp voltage    pot status      bath, metal     newpot         
temp ratio      enable function flag pc in/out  noise report    alarm watch     pcram v/o      
change          volt setpoint   tap enable      select pots     repeater check  
access          feed setpoint   set enable      shift summary   pcram           
aet sequence    feed report     enable status   trace report    ratio entry

我现在的工作原理似乎应该有一种更有效的方式：

    public DataTable CreateMenuTable()
    {

        DataTable userFunctions = GetMenus();
        DataTable menuTable = new DataTable();
        DataRow menuRow;
        int rowNum = 0;

        int numColumns = (int)Math.Sqrt(userFunctions.Rows.Count);
        int numRows = (int)Math.Ceiling(userFunctions.Rows.Count / (float)numColumns);

        for (int i = 0; i < numColumns; i++)
        {
            menuTable.Columns.Add(new DataColumn("Col" + (i + 1), System.Type.GetType("System.String")));
        }

        for (int i = 0; i < numRows; i++)
        {
            menuRow = menuTable.NewRow();
            menuTable.Rows.Add(menuRow);
        }

        foreach (DataRow row in userFunctions.AsEnumerable())
        {
            if (rowNum < numRows)
            {
                menuRow = menuTable.Rows[rowNum];
                menuRow["Col1"] = row["function_id"];                 
            }

            if (rowNum >= numRows & rowNum < (numRows * 2))
            {
                menuRow = menuTable.Rows[rowNum - (numRows)];
                menuRow["Col2"] = row["function_id"];
            }

            if (rowNum >= (numRows * 2) & rowNum < (numRows * 3))
            {
                menuRow = menuTable.Rows[rowNum - (numRows * 2)];
                menuRow["Col3"] = row["function_id"];
            }

            if (rowNum >= (numRows * 3) & rowNum < (numRows * 4))
            {
                menuRow = menuTable.Rows[rowNum - (numRows * 3)];
                menuRow["Col4"] = row["function_id"];
            }

            if (rowNum >= (numRows * 4) & rowNum < (numRows * 5))
            {
                menuRow = menuTable.Rows[rowNum - (numRows * 4)];
                menuRow["Col5"] = row["function_id"];
            }

            if (rowNum >= (numRows * 5) & rowNum < (numRows * 6))
            {
                menuRow = menuTable.Rows[rowNum - (numRows * 5)];
                menuRow["Col6"] = row["function_id"];
            }

            rowNum++;                
        }
        return menuTable;
    }

Answer 1

您可以避免所有if这样的事情：

// Calculate to which column this should belong
int columnNumber = rowNum / numRows + 1;
// % just return the remainder of the division between two numbers
// if you think about it it's the same as rowNum - (numRows)*K
menuRow = menuTable.Rows[rowNum % numRows];
// put it in the right column
menuRow["Col"+columnNumber] = row["function_id"];

从列表创建表

1 个答案: