来自多个表的图表

debugcn 发表于 Dev

乔纳斯·威兰德

我有三个名为存款、借记和转账的表，比如

Deposit  { DepositID, DepostDate, Amount}
Debit    { DebitID, DebitDate, Amount}
Transfer { TransferID, TransferDate, Amount}

如何在一张图表中显示所有三个表？我什至想知道将这三张桌子放在一张桌子上是否更好，比如

Transaction {TransactionId, TransactionTypeId, TransactionDate, Amount}

其中 TransactiontypeId 可以是 1 = 存款，2 是借方，3 是转账，并将此交易表绑定到图表。假设我将所有这些都放在一张表中，并使用表名 Transactions 然后 @mm8 帮助我解决了这个问题：

 var result = (from pr in db.Transactions 
                  join tr in db.TransactionType on pr.TrTypeId equals tr.TransactionTypeId
                  select new
                  {
                      TransactionDate = pr.TransactionDate,
                      TransactionType = tr.TrType,
                      Amount = pr.Amount

                  }).ToList();

chart1.DataSource = result
 .GroupBy(x => x.TransactionDate.Value.Year)
    .Select(g => new
    {
        Year = g.Key,
        TransactionType = g. //////
        Amount = g.Sum(y => y.Amount)
    })
    .ToArray();

最好是从一个表或多个表中获得一个图表以及如何做多个。

我知道我必须为每个表创建不同的系列，如下所示：

var Depseries = chart1.Series.Add("Deposit");
Depseries.XValueMember = "Year";
Depseries.YValueMembers = "DepositAmount";
Depseries.Name = "Deposit";
chart1.ChartAreas["ChartArea1"].AxisX.Interval = 1;
chart1.Series["Deposit"].IsValueShownAsLabel = true;
Depseries.CustomProperties = "LabelStyle=Left";

// Debit

var Debseries = chart1.Series.Add("Debit");
Debseries.XValueMember = "Year";
Debseries.YValueMembers = "DebitAmount";
Debseries.Name = "Debit";
chart1.ChartAreas["ChartArea1"].AxisX.Interval = 1;
chart1.Series["Debit"].IsValueShownAsLabel = true;
Debseries.CustomProperties = "LabelStyle=Left";

// Transfer
var FDseries = chart1.Series.Add("Transfer");
FDseries.XValueMember = "Year";
FDseries.YValueMembers = "TransferAmount";
FDseries.Name = "Transfer";
chart1.ChartAreas["ChartArea1"].AxisX.Interval = 1;
chart1.Series["Transfer"].IsValueShownAsLabel = true;
FDseries.CustomProperties = "LabelStyle=Left";

毫米8

您可以只从每个表中选择数据，然后使用该DataBind方法用数据填充系列，例如：

var deposits = (from x in db.Deposits select new { x.DepositDate, x.Amount })
    .ToArray()
    .GroupBy(x => x.DepositDate.Year)
    .Select(g => new { Year = g.Key, Amount = g.Sum(y => y.Amount) })
    .ToArray();
var Depseries = chart1.Series.Add("Deposit");
Depseries.XValueMember = "Year";
Depseries.YValueMembers = "DepositAmount";
Depseries.Name = "Deposit";
chart1.ChartAreas["ChartArea1"].AxisX.Interval = 1;
chart1.Series["Deposit"].IsValueShownAsLabel = true;
Depseries.CustomProperties = "LabelStyle=Left";
chart1.Series["Deposit"].Points.DataBind(deposits, "Year", "Amount", null);

var debits = (from x in db.Debits select new { x.DebitDate, x.Amount })
    .ToArray()
    .GroupBy(x => x.DebitDate.Year)
    .Select(g => new { Year = g.Key, Amount = g.Sum(y => y.Amount) })
    .ToArray();
var Debseries = chart1.Series.Add("Debit");
Debseries.XValueMember = "Year";
Debseries.YValueMembers = "DebitAmount";
Debseries.Name = "Debit";
chart1.ChartAreas["ChartArea1"].AxisX.Interval = 1;
chart1.Series["Debit"].IsValueShownAsLabel = true;
Debseries.CustomProperties = "LabelStyle=Left";
chart1.Series["Debit"].Points.DataBind(debits, "Year", "Amount", null);

...

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