比较数据集中的单元格和预置信息
本文关键字：信息 单元格 数据 数据集 集中 比较 | 更新日期: 2023-09-27 18:36:15
好吧，我对我的 C# 有点生疏，所以这可能很容易，我只是没有得到，但它晚了，我的大脑很痛。我正在尝试获取数据集中的每个值，如果它们短于给定长度，则在开头添加零。问题是我不知道如何实现它的概念。任何帮助表示赞赏。这就是我目前所拥有的。
//Connection and location to Excel file
OleDbConnection conn = new OleDbConnection();
conn.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source= C:''Users''User''Desktop''New folder''DHS_Weekly.xlsx; Extended Properties= '"Excel 12.0;HDR=No;IMEX=1;ImportMixedTypes=Text;'"";
//Select location in the file
OleDbCommand command = new OleDbCommand
(
"SELECT * FROM [WEEKLY.COOLING.PAYMENT$C:D]", conn
);
//Create a dataset to temp store the information
DataSet dsDHS = new DataSet();
OleDbDataAdapter adapter = new OleDbDataAdapter(command);
adapter.Fill(dsDHS);
//Having the data Grid display the results of the data set DHS(dsDHS)
dataGridView1.DataSource = dsDHS.Tables[0];
//New string that sets the path to the output of a text file
//The dataset will be output to this text file
string path = @"C:''Users''User''Desktop''New folder''DHStest.txt";
//New streamwriter and stringbuilder that uses the path created above
StreamWriter textOut = new StreamWriter(new FileStream(path, FileMode.Create, FileAccess.Write));
StringBuilder str = new StringBuilder();
//uses strings to correctly display the dataset
//removes the last 3 rows from output (2 Null rows and last line not needed)
//removes the first row by starting at 1 instead of zero. (first row is null)
for (int i = 1; i <= dsDHS.Tables[0].Rows.Count - 3; i++)
{
for (int j = 0; j <= dsDHS.Tables[0].Columns.Count - 1; j++)
{
str.Append(dsDHS.Tables[0].Rows[i][j].ToString());
}
//Adds a new line between each row
str.AppendLine();
}
//writes the output, this is just so I can check things before finalizing
textOut.Write(str.ToString());
textOut.Close();
}
}
}
假设我正确理解您的目标，并且您想要 6 个字符的最终长度：
for (int j = 0; j <= dsDHS.Tables[0].Columns.Count - 1; j++)
{
var originalValue = dsDHS.Tables[0].Rows[i][j].ToString();
var padded = originalValue.PadLeft(6, '0');
str.Append(padded);
}
将"6"更改为所需的最终宽度。
我不确定要在代码中的哪个位置执行此操作，但您需要使用 String.PadLeft：
str.Append(dsDHS.Tables[0].Rows[i][j].ToString().PadLeft(5, "0"c));
这将确保所有字符串都是 5 个字符，并在较短时添加前导零。
I recently had a similar requirement where decimal/float values were needed in a 10-digit format with 4 decimal places. (For example: "000123.4560").
Here's how I did it. (There's probably a simpler method, but it's been working great so far...):
int k = 0;
bool DecFound = false;
string s1=TodaysResults[1, i].ToString();
string IntegerDigits = "";
string DecimalDigits = "";
for (int j = 0; j < s1.Length; j++)
{
if (s1.Substring(j, 1) == ".")
{
k = j;
DecFound = true;
}
if (DecFound == false)
{
IntegerDigits += s1.Substring(j, 1);
}
else
{
DecimalDigits += s1.Substring(j, 1);
}
}
switch (IntegerDigits.Length)
{
case 0:
IntegerDigits = "000000";
break;
case 1:
IntegerDigits = "00000" + IntegerDigits;
break;
case 2:
IntegerDigits = "0000" + IntegerDigits;
break;
case 3:
IntegerDigits = "000" + IntegerDigits;
break;
case 4:
IntegerDigits = "00" + IntegerDigits;
break;
case 5:
IntegerDigits = "0" + IntegerDigits;
break;
default:
break;
}
switch (DecimalDigits.Length)
{
case 0:
DecimalDigits = DecimalDigits + ".0000";
break;
case 1:
DecimalDigits = DecimalDigits + "0000";
break;
case 2:
DecimalDigits = DecimalDigits + "000";
break;
case 3:
DecimalDigits = DecimalDigits + "00";
break;
case 4:
DecimalDigits = DecimalDigits + "0";
break;
default:
break;
}
}