常见速度单位换算关系行列式

常见速度术语,速度单位有马赫,节,码,迈,千米/时(公里/时),米/秒.

千米/时(公里/时:km/h),米/秒:(m/s)

1m/s=3.6km/h

最常用的速度单位,汽车中多用码来代表千米每小时,比如72码就是72千米每小时,也就是20米每秒

马赫(Mach)

多用于战机,导弹,火箭的速度

马赫（Mach）是表示速度相对于声速的倍数的单位。1马赫等于声速的速度，在标准大气压和温度为15摄氏度时，声速大约为1225.1千米每小时，或者约为340.3米每秒。

一马赫即一倍音速：马赫数小于1者为亚音速，马赫数大于5左右为超高音速；马赫数是飞行的速度和当时飞行的音速之比值，大于1表示比音速快，同理，小于1是比音速慢。

节(knot)

多用于舰船,民航速度

节（knot）是航海和航空中常用的速度单位，1节等于1海里每小时。1海里等于1852米，因此1节相当于1852米每小时，或者大约0.5144米每秒。

码(yard)

多用于汽车速度

码,就是千米每小时 或者公里每小时. 时速60码其意思就是60公里每小时，这也是最常用的时速单位

迈(mph)

多用于汽车速度

表示英里每小时（mph，全称miles-per-hour，俗称“迈”）。是一速度计量单位，表示英里/每小时。1迈=1.609344公里/小时。

为了方便运算,这里,我们全部以千米每时(km/h)作为统一单位,

规定声速为340m/s,海里为1852m/h,迈为1609m/h

新建窗体应用程序SpeedUnitDemo,将默认的Form1重命名为FormSpeedUnit

窗体FormSpeedUnit设计如下:

窗体设计器代码如下:

文件FormSpeedUnit.Designer.cs

namespace SpeedUnitDemo

{

partial class FormSpeedUnit

{

///

/// 必需的设计器变量。

///

private System.ComponentModel.IContainer components = null;

///

/// 清理所有正在使用的资源。

///

/// 如果应释放托管资源，为 true；否则为 false。

protected override void Dispose(bool disposing)

{

if (disposing && (components != null))

{

components.Dispose();

}

base.Dispose(disposing);

}

#region Windows 窗体设计器生成的代码

///

/// 设计器支持所需的方法 - 不要修改

/// 使用代码编辑器修改此方法的内容。

///

private void InitializeComponent()

{

this.dgvSpeed = new System.Windows.Forms.DataGridView();

this.dgvcSpare = new System.Windows.Forms.DataGridViewTextBoxColumn();

this.dgvcKmh = new System.Windows.Forms.DataGridViewTextBoxColumn();

this.dgvcMs = new System.Windows.Forms.DataGridViewTextBoxColumn();

this.dgvcMach = new System.Windows.Forms.DataGridViewTextBoxColumn();

this.dgvcKnot = new System.Windows.Forms.DataGridViewTextBoxColumn();

this.dgvcYard = new System.Windows.Forms.DataGridViewTextBoxColumn();

this.dgvcMph = new System.Windows.Forms.DataGridViewTextBoxColumn();

this.rtxtMessage = new System.Windows.Forms.RichTextBox();

((System.ComponentModel.ISupportInitialize)(this.dgvSpeed)).BeginInit();

this.SuspendLayout();

//

// dgvSpeed

//

this.dgvSpeed.AllowUserToAddRows = false;

this.dgvSpeed.AllowUserToDeleteRows = false;

this.dgvSpeed.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;

this.dgvSpeed.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {

this.dgvcSpare,

this.dgvcKmh,

this.dgvcMs,

this.dgvcMach,

this.dgvcKnot,

this.dgvcYard,

this.dgvcMph});

this.dgvSpeed.Location = new System.Drawing.Point(12, 12);

this.dgvSpeed.Name = "dgvSpeed";

this.dgvSpeed.ReadOnly = true;

this.dgvSpeed.RowHeadersWidth = 23;

this.dgvSpeed.RowTemplate.Height = 23;

this.dgvSpeed.Size = new System.Drawing.Size(1042, 300);

this.dgvSpeed.TabIndex = 0;

this.dgvSpeed.CellClick += new System.Windows.Forms.DataGridViewCellEventHandler(this.dgvSpeed_CellContentClick);

this.dgvSpeed.CellContentClick += new System.Windows.Forms.DataGridViewCellEventHandler(this.dgvSpeed_CellContentClick);

//

// dgvcSpare

//

this.dgvcSpare.HeaderText = "速度单位A/速度单位B";

this.dgvcSpare.Name = "dgvcSpare";

this.dgvcSpare.ReadOnly = true;

this.dgvcSpare.Width = 160;

//

// dgvcKmh

//

this.dgvcKmh.HeaderText = "千米/时(km/h)";

this.dgvcKmh.Name = "dgvcKmh";

this.dgvcKmh.ReadOnly = true;

this.dgvcKmh.Width = 150;

//

// dgvcMs

//

this.dgvcMs.HeaderText = "米/秒(m/s)";

this.dgvcMs.Name = "dgvcMs";

this.dgvcMs.ReadOnly = true;

this.dgvcMs.Width = 140;

//

// dgvcMach

//

this.dgvcMach.HeaderText = "马赫(Mach)";

this.dgvcMach.Name = "dgvcMach";

this.dgvcMach.ReadOnly = true;

this.dgvcMach.Width = 140;

//

// dgvcKnot

//

this.dgvcKnot.HeaderText = "节(knot)";

this.dgvcKnot.Name = "dgvcKnot";

this.dgvcKnot.ReadOnly = true;

this.dgvcKnot.Width = 140;

//

// dgvcYard

//

this.dgvcYard.HeaderText = "码(yard)";

this.dgvcYard.Name = "dgvcYard";

this.dgvcYard.ReadOnly = true;

this.dgvcYard.Width = 140;

//

// dgvcMph

//

this.dgvcMph.HeaderText = "迈(mph)";

this.dgvcMph.Name = "dgvcMph";

this.dgvcMph.ReadOnly = true;

this.dgvcMph.Width = 140;

//

// rtxtMessage

//

this.rtxtMessage.Location = new System.Drawing.Point(12, 318);

this.rtxtMessage.Name = "rtxtMessage";

this.rtxtMessage.ReadOnly = true;

this.rtxtMessage.Size = new System.Drawing.Size(1040, 188);

this.rtxtMessage.TabIndex = 1;

this.rtxtMessage.Text = "";

//

// FormSpeedUnit

//

this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);

this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

this.ClientSize = new System.Drawing.Size(1064, 531);

this.Controls.Add(this.rtxtMessage);

this.Controls.Add(this.dgvSpeed);

this.Name = "FormSpeedUnit";

this.Text = "速度单位换算表格（行列式）";

this.Load += new System.EventHandler(this.FormSpeedUnit_Load);

((System.ComponentModel.ISupportInitialize)(this.dgvSpeed)).EndInit();

this.ResumeLayout(false);

}

#endregion

private System.Windows.Forms.DataGridView dgvSpeed;

private System.Windows.Forms.DataGridViewTextBoxColumn dgvcSpare;

private System.Windows.Forms.DataGridViewTextBoxColumn dgvcKmh;

private System.Windows.Forms.DataGridViewTextBoxColumn dgvcMs;

private System.Windows.Forms.DataGridViewTextBoxColumn dgvcMach;

private System.Windows.Forms.DataGridViewTextBoxColumn dgvcKnot;

private System.Windows.Forms.DataGridViewTextBoxColumn dgvcYard;

private System.Windows.Forms.DataGridViewTextBoxColumn dgvcMph;

private System.Windows.Forms.RichTextBox rtxtMessage;

}

}

FormSpeedUnit相关代码如下:

文件FormSpeedUnit.cs

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace SpeedUnitDemo

{

public partial class FormSpeedUnit : Form

{

///

/// 声速为340m/s

///

const decimal soundVelocity = 340M;//声速为340m/s

///

/// 1海里=1852m

///

const decimal mile = 1852M;//1海里=1852m

///

/// 1迈=1609m

///

const decimal mph = 1609M;//1迈=1609m

///

/// 米每秒 与 千米每小时的换算关系 1m/s=3.6km/h

///

const decimal rate = 3.6M;//1m/s=3.6km/h

public FormSpeedUnit()

{

InitializeComponent();

/*

* 为了方便运算,这里,我们全部以千米每时(km/h)作为统一单位,

* 规定声速为340m/s,

* 海里为1852m/h,

* 迈为1609m/h

*/

dgvSpeed.AutoGenerateColumns = false;

dgvcSpare.DataPropertyName = "SpeedUnit";

dgvcKmh.DataPropertyName = "Kmh";

dgvcMs.DataPropertyName = "Ms";

dgvcMach.DataPropertyName = "Mach";

dgvcKnot.DataPropertyName = "Knot";

dgvcYard.DataPropertyName = "Yard";

dgvcMph.DataPropertyName = "Mph";

}

private void FormSpeedUnit_Load(object sender, EventArgs e)

{

DataTable dataTable = new DataTable("SpeedUnit");

dataTable.Columns.Add("SpeedUnit", typeof(string));

dataTable.Columns.Add("Kmh", typeof(decimal));

dataTable.Columns.Add("Ms", typeof(decimal));

dataTable.Columns.Add("Mach", typeof(decimal));

dataTable.Columns.Add("Knot", typeof(decimal));

dataTable.Columns.Add("Yard", typeof(decimal));

dataTable.Columns.Add("Mph", typeof(decimal));

//全部换算为千米每小时，统一单位km/h

decimal oneKmh = 1M;//千米每小时

decimal oneMs = rate;//米每秒

decimal oneMach = rate * soundVelocity;//马赫

decimal oneKnot = mile / 1000;//节

decimal oneYard = oneKmh;//码，就是千米每小时

decimal oneMph = mph / 1000;//迈

dataTable.Rows.Add("千米/时(km/h)", oneKmh / oneKmh, oneKmh / oneMs, oneKmh / oneMach, oneKmh / oneKnot, oneKmh / oneYard, oneKmh / oneMph);

dataTable.Rows.Add("米/秒(m/s)", oneMs / oneKmh, oneMs / oneMs, oneMs / oneMach, oneMs / oneKnot, oneMs / oneYard, oneMs / oneMph);

dataTable.Rows.Add("马赫(Mach)", oneMach / oneKmh, oneMach / oneMs, oneMach / oneMach, oneMach / oneKnot, oneMach / oneYard, oneMach / oneMph);

dataTable.Rows.Add("节(knot)", oneKnot / oneKmh, oneKnot / oneMs, oneKnot / oneMach, oneKnot / oneKnot, oneKnot / oneYard, oneKnot / oneMph);

dataTable.Rows.Add("码(yard)", oneYard / oneKmh, oneYard / oneMs, oneYard / oneMach, oneYard / oneKnot, oneYard / oneYard, oneYard / oneMph);

dataTable.Rows.Add("迈(mph)", oneMph / oneKmh, oneMph / oneMs, oneMph / oneMach, oneMph / oneKnot, oneMph / oneYard, oneMph / oneMph);

dgvSpeed.DataSource = dataTable;

}

private void dgvSpeed_CellContentClick(object sender, DataGridViewCellEventArgs e)

{

rtxtMessage.Clear();

if (e.ColumnIndex <= 0 || e.RowIndex < 0)

{

//不考虑列头【RowIndex为-1】、不考虑速度单位描述列【ColumnIndex为0】

return;

}

rtxtMessage.AppendText($"1{dgvSpeed["dgvcSpare", e.RowIndex].Value}={dgvSpeed[e.ColumnIndex, e.RowIndex].Value}{dgvSpeed.Columns[e.ColumnIndex].HeaderText}");

}

}

}

运行如图: