如何在00.00格式中获取文本框浮点值 [英] How to get text box float value in 00.00 formate

问题描述

当用户输入10时，在winform文本框中

i使用float.parse（textbox1.text）将此值存储在float中

值存储为int（10）



但是我希望将它存储在10.00格式中



之后我对这个值做了一些divison事件

并且假设答案是5.239694105

i也希望这个答案为5.24







有人可以详细解释一下如何做到这一点吗？

i am newbe in c＃



我尝试过：



使用（SqlConnection conn = new SqlConnection（con））

{

使用（SqlCommand cmd = new SqlCommand（usp_weightinsertdetails，conn））

{

cmd.CommandType = CommandType.StoredProcedure;



cmd.Parameters.AddWithValue（@ Date，dateTimePicker1.Value）;

c md.Parameters.AddWithValue（@ ProductName，textBox1.Text）;

cmd.Parameters.AddWithValue（ProductPieces，int.Parse（textBox2.Text））;



浮动重量，个人电脑，avr;

重量= float.Parse（textBox3.Text）;

pc = float.Parse（ textBox2.Text）;

avr =重量/ pc;



cmd.Parameters.AddWithValue（@ ProductWeight，重量）;

cmd.Parameters.AddWithValue（@ AveragePieceWeight，avr）;



conn.Open（）;

cmd.ExecuteNonQuery（）;

解决方案

使用格式字符串以所需的格式获取输出。请参阅 Single.ToString Method（String）（System） [ ^ ]。你还应该阅读每个计算机科学家应该知道的关于浮点运算的知识 [ ^ ]。

当您将数字和日期转换为字符串时，数字和日期只会获得格式，因此您的问题的答案是您不能以特定格式存储浮点数。保持浮动状态，当你想要显示它时将其转换为所需格式的字符串;

  float  f = 10F; 
 System.Diagnostics.Debug.WriteLine（f.ToString（  0.00））; 
 
 f =  1  .123F; 
 System.Diagnostics.Debug.WriteLine（f.ToString（  0.00））; 

in winform text box when user enter 10 and
i store this value in float using float.parse(textbox1.text)
value store as int (10)

but i want to store it in 10.00 formate

after that i do some divison methametic on this value
and suppose answer is 5.239694105
i also want this answer to 5.24



can someone explain me in detail how to do this ?
i am newbe in c#

What I have tried:

using (SqlConnection conn = new SqlConnection(con))
{
using (SqlCommand cmd = new SqlCommand("usp_weightinsertdetails", conn))
{
cmd.CommandType = CommandType.StoredProcedure;

cmd.Parameters.AddWithValue("@Date", dateTimePicker1.Value);
cmd.Parameters.AddWithValue("@ProductName", textBox1.Text);
cmd.Parameters.AddWithValue("ProductPieces", int.Parse(textBox2.Text));

float weight, pc, avr;
weight = float.Parse(textBox3.Text);
pc = float.Parse(textBox2.Text);
avr = weight / pc;

cmd.Parameters.AddWithValue("@ProductWeight", weight);
cmd.Parameters.AddWithValue("@AveragePieceWeight", avr);

conn.Open();
cmd.ExecuteNonQuery();

解决方案

Use a format string to get the output in the required form. See Single.ToString Method (String) (System)[^]. you should also read What Every Computer Scientist Should Know About Floating-Point Arithmetic[^].

Numbers and dates only gain a "format" when you convert them to a string, so the answer to your question is that you can't store your float in a certain format. Keep it as float and when you want to show it convert it to a string of the required format;

float f = 10F;
System.Diagnostics.Debug.WriteLine(f.ToString("0.00"));

f = 1.123F;
System.Diagnostics.Debug.WriteLine(f.ToString("0.00"));

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