我正在尝试使用Flow正确键入redux动作，但是在使用常量作为动作类型时，它没有正确地检查不连续类型。
我在很多地方都读到这是正确的方法，但是我无法获取// @flow
export const INCREMENT: 'INCREMENT' = 'INCREMENT';
export type IncrementAction = {|
type: typeof INCREMENT,
|};
export const DECREMENT: 'DECREMENT' = 'DECREMENT';
export type DecrementAction = {|
type: typeof DECREMENT,
|};
export const DOUBLE: 'DOUBLE' = 'DOUBLE';
export type DoubleAction = {|
type: typeof DOUBLE,
|};
// Notice I didn't include DoubleAction
export type Action = IncrementAction | DecrementAction;
type State = {|
counter: number,
|};
export const reducer = (state: State, action: Action): State => {
switch (action.type) {
case INCREMENT:
return { counter: state.counter + 1 };
case DECREMENT:
return { counter: state.counter - 1 };
// This case should fail because it's in none of the actions in the disjoint union
case DOUBLE:
return { counter: state.counter * 2 };
// This case does fail because it's a literal instead of a constants
case 'TRIPLE':
return { counter: state.counter * 3 };
default:
return state;
}
};
常量来出错（因此，这实际上并不是正确键入switch语句）。
还有另一种方法吗？
private void giderBtn_Click(object sender, EventArgs e)
{
giderPnl.Visible = true; gelirPnl.Visible = false;
this.GiderTableAdapter.Fill(this.giderDS.Gider);
ReportDataSource r = new ReportDataSource("DataSet1", giderDS.Tables[0]);
this.reportViewer1.LocalReport.DataSources.Clear();
this.reportViewer1.LocalReport.DataSources.Add(r);
this.reportViewer1.LocalReport.ReportEmbeddedResource = "GelirGiderYonetimi.giderRapor.rdlc";
this.reportViewer1.LocalReport.Refresh();
this.reportViewer1.RefreshReport();
}
private void gelirBtn_Click(object sender, EventArgs e)
{
giderPnl.Visible = false; gelirPnl.Visible = true;
this.GelirTableAdapter.Fill(this.gelirDS.Gelir);
ReportDataSource r = new ReportDataSource("DataSet1", gelirDS.Tables[0]);
this.reportViewer1.LocalReport.DataSources.Clear();
this.reportViewer1.LocalReport.DataSources.Add(r);
this.reportViewer1.LocalReport.ReportEmbeddedResource = "GelirGiderYonetimi.gelirRapor.rdlc";
this.reportViewer1.LocalReport.Refresh();
this.reportViewer1.RefreshReport();
}