form-control | 易学教程

How to dock a windows form in C#?

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问题 I just would like to know if it is possible to dock a windows form on top of the user screen? I have been trying to do this by manually setting the position of my form to the coordinates I want. But using this method, however, allows the user to change the position of the form just by dragging it. I want to make the form docked to the upper portion of the screen since this window form will server as a menu for the project I am making. Thanks a lot. :) 回答1: I would consider using the Control

UI Thread Safety

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问题 Any suggestions on the best way to ensure thread safety when changing the properties on Form controls? I have been using Me. Invoke in the past, and I was wondering if you have pros/cons, comments, suggestions, etc. 回答1: Invoke is the proper way to do it if you're pushing stuff at the form from another thread. But you might consider whether the form might be better pulling data itself, perhaps from a timer, and perhaps less frequently than a background process might push individual updates.

how do i bind output values of another component to a form-control in my component

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问题 This is my html code which is basically a form. <form [formGroup]="calculatedForm" fxLayout="column" fxLayoutGap="15px" fxLayoutAlign="start space-betwen"> <label for="category">CATEGORY</label> <app-toggle-button-group [items]="categories" [selectedItem]="getselectedCategory()" (valueChange)="updateCategory($event)" [disableButtons]="calculatedForm.value.system"> </app-toggle-button-group> <label for="input_interval">INTERVAL</label> <app-toggle-button-group [items]="inputIntervals"

Multiple form controls in child component with control value accessor using Angular 5

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问题 I want to implement a functionality with control value accessor in Angular 5. It's like to access multiple form control in child custom component from a parent. Please let me know if I can achieve this in another way. Template driven form compulsory. If there is any other any to generic create a custom control with two-way data binding, please let me know. It would great if answers are in Plunker or StackBlitz. Here is mine: https://stackblitz.com/edit/angular-qzioet Parent component :-

Getting issue in registering contorl with form in Angular Reactive forms

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问题 I am working on Angular Reactive forms. Initially I have an formarray in formgroup. afterwards I push formgroup into formarray to add form control dynamically. I am getting an issue when binding these control using formControlName. I am getting this Error: Cannot find control with path: 'controlArray -> 0 -> value' here is my component class code: ngOnInit(){ this.reviewForm = this.fb.group({ 'controlArray': new FormArray([]) }); this.showDefaultForm(); } First I am getting data in formsDb,

Angular 6: How to use FormGroup to create formControlName dynamically?

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问题 I want formControlName Like this, field_0 field_1 field_2 myObj = { "field_0":"value_0", "field_1":"value_1", "field_2":"value_2", } } 回答1: if you have some like fields=["field_0","field_1","field_2"] You first must create a FormGroup createForm(fields: string[]) { let group: any = {}; fields.forEach(x => { group[x] = new FormControl(); }) return new FormGroup(group); } And, when you want show it <form [formGroup]="form"> <div *ngFor="let field of fields"> <input [formControlName]="field"> <

Drop-down Lists with Conditional Data

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问题 i have three ranges of cells (from another sheet in my workbook) that store the values that i want to appear on the drop-down (Form Control) list. i need the macro code to reset a cell range, or a named range to define the options in a drop-down list based on other cell value. . i've tried the following code with no success so far: Sub DropDown11_Change() If Range("A1") = 1 Then (input range from sheet1 a1:a50) ElseIf Range("A1") = 2 Then (input range from sheet2 a1:a50) ElseIf Range("A1") =

Angular FormControl check if required

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问题 Is there a way to check whether control is required? The problem arose when I implemented a dedicated form field component which accepts FormControl and has not only input but also validation errors. Since some field are required it's good to let the user know if it's required by * . Is there a way to check the @Input() control: FormControl for Validators.required and display an asterisk? 回答1: You can do something like this: import { Component } from '@angular/core'; import { FormGroup,

Detect if a Form Control option button is selected in VBA

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问题 I have a code that work just fine using ActiveX option buttons. However, I want the macro to run on a Mac as well so I am trying to replace my ActiveX controls with form controls. With ActiveX, all I had to do in order to check if one of my two option buttons was selected is: Sub OptionButton1_Click If OptionButton1.Value = true then (action...) End if End sub I have been trying to find an equivalent for Form Controls on Google but each time I get an: Object required error Thank you very much

How do you tell if a Windows Form is open but behind another window?

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Calling Form.Visible will return true regardless of whether the form is maximized, minimized, or has a FormWindowState of Normal. What I want to know is how to tell if the form is open but "hidden" behind another application's window. If that's the case, I want to bring it to the front and actually make it visible to the user. I tried the BringToFront() method but it didn't work. I also tried calling the Show() method but if the form is behind another application's window, it remains that way. The only workaround I found to the problem is setting the Form's FormWindowState to Minimized