我有一本字典，用于定义铜缆的额定值。我想使用这些值来计算满足特定连接等级所需的电缆数量。连接的大小，电缆类型和系统类型由名为cb_amperage，cb_cable_size和cb_system_type的两个ComboBox选择。运行公式后找到的答案将显示在名为tb6_cable_qty的文本框中。我欢迎任何和所有意见和建议。提前感谢您的帮助。
数学很简单：
decimal x, y, z;
x = decimal.Parse(cb_amperage.);
y = decimal.Parse();//<---- this value must come from the dictionary below
a = decimal.Parse();//<---- this value must also come from a dictionary below
z = (x / y) * a
tb6_cable_qty.Text = Math.Round(z,2).ToString();
void Cb_amperageSelectedIndexChanged(object sender, EventArgs e)
{
if (!String.!IsNullOrEmpty(cb_amperage) & !String.IsNullOrEmpty(cb_cable_size))
//not sure if the above is right but I think it coveys the idea
{
//function based on the values in the dictionary below
}
//Cable Dictionary 1 used for cable quantity calculation
Dictionary<string, int> cable_dictionary_1 = new Dictionary<string, int>();
cable_dictionary_1.Add ("#1", 130);
cable_dictionary_1.Add ("1/0", 150);
cable_dictionary_1.Add ("2/0", 175);
cable_dictionary_1.Add ("3/0", 200);
cable_dictionary_1.Add ("4/0", 230);
cable_dictionary_1.Add ("250", 255);
cable_dictionary_1.Add ("300", 285);
cable_dictionary_1.Add ("400", 355);
cable_dictionary_1.Add ("500", 380);
cable_dictionary_1.Add ("600", 720);
cable_dictionary_1.Add ("750", 475);
//System Type Dictionary used for cable quantity calculation
Dictionary<string, int> system_type_dictionary = new Dictionary<string, int>();
system_type_dictionary.Add ("3P 3W", 3);
system_type_dictionary.Add ("3P 4W", 4);
编辑1： MMR;请看下面的代码。我有一种感觉，我错过了一些我知道的东西，如果我有点更加明确。以下是我建议的解决方案的第一部分的实现。我收到一个错误。我认为这是因为这两个项目，字符串和字典不知道它们应该被链接。这是错误; *类，结构或接口成员声明中的标记'，'无效（CS1519）。看看你能看到什么。再次感谢。
//The following strings are used in the cable quantity calculation
private const string cblsize1 = "#1";
private const string cblsize2 = "1/0";
private const string cblsize3 = "2/0";
private const string cblsize4 = "3/0";
//Cable Dictionary 1 used for cable quantity calculation
Dictionary<string, int> cable_dictionary_1 = new Dictionary<string, int>();
cable_dictionary.Add(cblsize1, 130);//#1 Cable
cable_dictionary.Add(cblsize2, 150);//1/0 Cable
cable_dictionary.Add(cblsize3, 175);//2/0 Cable
cable_dictionary.Add(cblsize4, 200);//3/0 Cable
答案 0 :(得分：0)
我不确定你的问题是什么？听起来你已经把它全部覆盖了。
答案 1 :(得分：0)
编辑：等等，现在我收到了你的问题！
这就是我要做的事情：
首先，对于每个键，将它们组成一个字符串列表，所以：
private const string mFirst = "#1";
然后，加入字典：
mDictionary.Add(mFirst, 130); //etc...
然后，对于每个组合框，添加字符串
comboBox1.Add(mFirst);
comboBox1.Add(mSecond); //etc...
然后，将一个事件添加到组合框中，选择索引已更改：
comboBox1_SelectedIndexChanged(SomeEventStuff I Forget)
当值更改时，更新y的值。对comboBox2执行相同操作，并更新z的值。更新任一值后，只需同时更新结果。
编辑2：
为了进行数学运算，我的函数看起来像是：
float CopperCalc(float inX, float inY, float inA){
if (inY != 0){//avoid the division by zero
return (inX / inY) * inA;
} else {
return 0; //just assume it's zero here.
}//I'm not Jon Skeet, I can't divide by zero
}
然后，在selectedindexchanged处理程序中调用该函数，并使用它来更新文本框：
//put your mX, mY, and mA as member values of your class, and then
//they get updated. For instance:
void comboBox1_SelectedIndexChanged(Events){
mX = mDictionary[comboBox1.SelectedItem];
textBox1.Text = CopperCalc(mX, mY, mA).ToString("f1");
}
并为每个组合框添加相同的功能，以便在组合框更新时，文本框也会更新。 如果你想尝试自动确定电线的组合应该是自动的，那么这个东西才有意义：
这听起来像Knapsack Problem的变体 - 这是正确的吗？您需要找出一些最小的铜线组合，以满足连接要求？是否有一些最小或最大或其他约束？为什么不抛出大量的铜来满足最低要求呢？
这是一个非常漫长的说法，我认为我需要更多信息才能理解问题;但是，如果背包问题是一个合理的类比，那么有解决方案，但它们是NP完全实现的。也就是说，它们不会“快速”运行，但如果你只有十二个线规（或其他），你可能应该没有速度。
答案 2 :(得分：0)
解决!!!! 下面是代码。感谢MSDN C＃论坛的Rudedog2！
partial class MainForm
{
double x, y, z;
List<string> cable_size1;
List<string> system_type_list;
List<string> amperage;
Dictionary<string, double> cable_dictionary_1;
Dictionary<string, double> system_type;
Dictionary<string, double> amperage_dictionary;
private void MainFormLoad(object sender, EventArgs e)
{
//Each of the following lists populate the ComboBoxes
//to be selected on the main form.
amperage = new List<string>();
cable_size1 = new List<string>();
system_type_list = new List<string>();
cable_dictionary_1 = new Dictionary<string, double>();
system_type = new Dictionary<string, double>();
amperage_dictionary = new Dictionary<string, double>();
//
InitializeCurrentLoadCB();
InitializeCableSizeCB();
InitializeSystemTypeCB();
//---------------Dictionaries---------------------------------------------------------
InitializeSystemTypeLookup();
InitializeCableLookup();
InitializeAmperageLookup();
}
private void InitializeCurrentLoadCB()
{
//Amperage List, No Exclusions-----------------------------------------------------------
amperage = new List<string>();
amperage.Add("Please Select Amperage");
amperage.Add("400");
amperage.Add("800");
amperage.Add("1000");
amperage.Add("1200");
amperage.Add("1600");
amperage.Add("2000");
amperage.Add("2500");
amperage.Add("3000");
amperage.Add("3200");
amperage.Add("4000");
amperage.Add("5000");
amperage.Add("6000");
cb_test_1.DataSource = amperage;
cb_test_1.SelectedIndex = 0;
cb_test_1.DropDownStyle = ComboBoxStyle.DropDownList;
}
private void InitializeCableSizeCB()
{
//Cable List, No Exclusions --------------------------------------------------------------
cable_size1 = new List<string>();
cable_size1.Add("Please Select Cable Size");
cable_size1.Add ("#1");
cable_size1.Add ("1/0");
cable_size1.Add ("2/0");
cable_size1.Add ("3/0");
cable_size1.Add ("4/0");
cable_size1.Add ("250");
cable_size1.Add ("300");
cable_size1.Add ("400");
cable_size1.Add ("500");
cable_size1.Add ("600");
cable_size1.Add ("700");
cable_size1.Add ("750");
cb_test_2.DataSource = cable_size1;
cb_test_2.SelectedIndex = 0;
cb_test_2.DropDownStyle = ComboBoxStyle.DropDownList;
//Initial DataBind for cable size ComboBox
}
private void InitializeSystemTypeCB()
{
//System Type List
system_type_list = new List<string>();
system_type_list.Add("Select System Type");
system_type_list.Add("3 Phase 3 Wire");
system_type_list.Add("3 Phase 4 Wire");
cb_test_3.DataSource = system_type_list;
cb_test_3.SelectedIndex = 0;
cb_test_3.DropDownStyle = ComboBoxStyle.DropDownList;
//Initial DataBind for cb_system type ComboBox
}
private void Button1Click(object sender, System.EventArgs e)
{
if (!String.IsNullOrEmpty(cb_test_1.Text) &&
(!String.IsNullOrEmpty(cb_test_2.Text) &&
(!String.IsNullOrEmpty(cb_test_3.Text))))
{
double a;
if (cb_test_1.SelectedIndex != 0)
{
x = amperage_dictionary[amperage[cb_test_1.SelectedIndex]];
}
if (cb_test_2.SelectedIndex != 0)
{
y = cable_dictionary_1[cable_size1[cb_test_2.SelectedIndex]];
}
if (cb_test_3.SelectedIndex != 0)
{
z = system_type[system_type_list[cb_test_3.SelectedIndex]];
}
a = ((x / y)*z);
this.tb_1.Text = Math.Round(a,2).ToString();
}
}
private void InitializeSystemTypeLookup()
{
//System Type Dictionary
this.system_type = new Dictionary<string, double>();
this.system_type.Add(this.system_type_list[0], 0);
this.system_type.Add(this.system_type_list[1], 3);
this.system_type.Add(this.system_type_list[2], 4);
}
private void InitializeCableLookup()
{
//Cable Dictionary 1 used for cable quantity calculation
this.cable_dictionary_1 = new Dictionary<string, double>();
this.cable_dictionary_1.Add (this.cable_size1[0], 0);
this.cable_dictionary_1.Add (this.cable_size1[1], 130);
this.cable_dictionary_1.Add (this.cable_size1[2], 150);
this.cable_dictionary_1.Add (this.cable_size1[3], 175);
this.cable_dictionary_1.Add (this.cable_size1[4], 200);
this.cable_dictionary_1.Add (this.cable_size1[5], 230);
this.cable_dictionary_1.Add (this.cable_size1[6], 255);
this.cable_dictionary_1.Add (this.cable_size1[7], 285);
this.cable_dictionary_1.Add (this.cable_size1[8], 355);
this.cable_dictionary_1.Add (this.cable_size1[9], 380);
this.cable_dictionary_1.Add (this.cable_size1[10], 720);
this.cable_dictionary_1.Add (this.cable_size1[11], 475);
}
private void InitializeAmperageLookup()
{
//Amperage Dictionary
this.amperage_dictionary = new Dictionary<string, double>();
this.amperage_dictionary.Add(this.amperage[0], 0);
this.amperage_dictionary.Add(this.amperage[1], 400);
this.amperage_dictionary.Add(this.amperage[2], 800);
this.amperage_dictionary.Add(this.amperage[3], 1000);
this.amperage_dictionary.Add(this.amperage[4], 1200);
this.amperage_dictionary.Add(this.amperage[5], 1600);
this.amperage_dictionary.Add(this.amperage[6], 2000);
this.amperage_dictionary.Add(this.amperage[7], 2500);
this.amperage_dictionary.Add(this.amperage[8], 3000);
this.amperage_dictionary.Add(this.amperage[9], 3200);
this.amperage_dictionary.Add(this.amperage[10], 4000);
this.amperage_dictionary.Add(this.amperage[11], 5000);
this.amperage_dictionary.Add(this.amperage[12], 6000);
}
}