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EF+MVC+Bootstrap 项目实践 Day4

2015-12-12 23:07 567 查看


一、注册账户时显示注册表单

非常简单的一句js,但平时用习惯了jquery,原生的还不会写了。。。而且Razor的转成html也折腾了下

<a class="a" href="#" onclick="document.getElementById('RegisterForm').style.display='block'">注册账户</a>


Html.BeginForm("Index","Auth",FormMethod.Post,new {@id = "RegisterForm",@style = "display:none;"})


平时要显示,就是要把css的"display:none;"改成"display:block;",都是用jquery,$("#xx").show(),最多$("#xx").css("display","block"),甚至$("#xx").attr("style","display:block;")

原生的还以为是.style="display:block;",发现不对,再试了style.display="block;",也不行,分号不能多加。

Html.BeginForm,属性参数前面要加@,这个也折腾了一会

二、验证码

源码中验证码比较复杂,有十几种样式,还有各种公共方法基类什么的,我练习就不弄这么复杂了,去掉所有未使用的(VS或Resharper有这功能,没用到的会变灰色,就可以删除)

[AuthorizeIgnore]
public ActionResult VerifyImage()
{
var validateCodeHelper = new ValidateCodeHelper();
string code;
byte[] bytes = validateCodeHelper.CreateImage(out code);
//this.CookieContext.VerifyCodeGuid = VerifyCodeHelper.SaveVerifyCode(code);
return File(bytes, @"image/jpeg");
}


public class ValidateCodeHelper
{
public Color[] DrawColors{get;set;} = {
Color.FromArgb(0x6b,0x42,0x26),
Color.FromArgb(0x4f,0x2f,0x4f),
Color.FromArgb(50,0x99,0xcc),
Color.FromArgb(0xcd,0x7f,50),
Color.FromArgb(0x23,0x23,0x8e),
Color.FromArgb(0x70,0xdb,0x93),
Color.Red,
Color.FromArgb(0xbc,0x8f,0x8e)
};
private bool FontTextRenderingHint{get;set;}
public int ImageHeight{get;set;} = 30;
public int ValidataCodeLength{get;set;} = 4;
public int ValidataCodeSize{get;set;} = 0x10;
public string ValidateCodeFont{get;set;} = "Arial";

public byte[] CreateImage(out string validataCode)
{
Bitmap bitmap;
string formatString = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";
GetRandom(formatString,ValidataCodeLength,out validataCode);
MemoryStream stream = new MemoryStream();
ImageBmp(out bitmap,validataCode);
bitmap.Save(stream,ImageFormat.Png);
bitmap.Dispose();
stream.Close();
stream.Dispose();
return stream.GetBuffer();
}

private void CreateImageBmp(ref Bitmap bitMap,string validateCode)
{
Graphics graphics = Graphics.FromImage(bitMap);
Random random = new Random();
graphics.TextRenderingHint = FontTextRenderingHint ? TextRenderingHint.SingleBitPerPixel : TextRenderingHint.AntiAlias;
Font font = new Font(ValidateCodeFont,ValidataCodeSize,FontStyle.Regular);
int maxValue = Math.Max((ImageHeight - ValidataCodeSize) - 5,0);
for(int i = 0; i < ValidataCodeLength; i++){
Color color = DrawColors[random.Next(DrawColors.Length)];
Brush brush = new SolidBrush(color);
int[] numArray = {((i*ValidataCodeSize) + random.Next(1)) + 3,random.Next(maxValue) - 4};
Point point = new Point(numArray[0],numArray[1]);
graphics.DrawString(validateCode[i].ToString(),font,brush,point);
}
graphics.Dispose();
}

private void DisposeImageBmp(ref Bitmap bitmap)
{
Graphics graphics = Graphics.FromImage(bitmap);
graphics.Clear(Color.White);
Point[] pointArray = new Point[2];
Random random = new Random();
for(int i = 0; i < (ValidataCodeLength*2); i++){
Pen pen = new Pen(DrawColors[random.Next(DrawColors.Length)],1f);
pointArray[0] = new Point(random.Next(bitmap.Width),random.Next(bitmap.Height));
pointArray[1] = new Point(random.Next(bitmap.Width),random.Next(bitmap.Height));
graphics.DrawLine(pen,pointArray[0],pointArray[1]);
}
graphics.Dispose();
}

private static void GetRandom(string formatString,int len,out string codeString)
{
codeString = string.Empty;
string[] strArray = formatString.Split(',');
Random random = new Random();
for(int i = 0; i < len; i++){
int index = random.Next(0x186a0)%strArray.Length;
codeString = codeString + strArray[index];
}
}

private void ImageBmp(out Bitmap bitMap,string validataCode)
{
int width = (int) ((ValidataCodeLength*ValidataCodeSize)*1.2);
bitMap = new Bitmap(width,ImageHeight);
DisposeImageBmp(ref bitMap);
CreateImageBmp(ref bitMap,validataCode);
}
}


就是绘制随机4位英文,具体没细看,代码不算长。

三、登陆、新建

验证码还只是展示在页面上,登陆时还要对应起来,

//this.CookieContext.VerifyCodeGuid = VerifyCodeHelper.SaveVerifyCode(code);


这行注释掉的,应该就是要对照的。

四、EF

1、公共类



this.CookieContext.VerifyCodeGuid = VerifyCodeHelper.SaveVerifyCode(code);


为了这一行代码,源码引用了很多公共类(一个公共类里面有时又用到另一个公共类,只好依次都加进来),只好也在项目中加一下,以后也用的到。把不要的精简掉,也还可以。

2、生成实体

按网上学的,新建ADO.NET实体模型,有一个要注意,如果没勾选保存至web.config,生成的就叫Entities,而不是取名的AccountEntities。

3、SaveChanges()

EF也是奇葩,SaveChanges()不报错,直接就没反应了

public virtual int SaveChanges()
{
try
{
if (this.ValidateOnSaveEnabled)
{
IEnumerable<DbEntityValidationResult> validationErrors = this.Owner.GetValidationErrors();
if (Enumerable.Any<DbEntityValidationResult>(validationErrors))
throw new DbEntityValidationException(Strings.DbEntityValidationException_ValidationFailed, validationErrors);
}
return this.ObjectContext.SaveChanges((System.Data.Entity.Core.Objects.SaveOptions) (1 | (this.AutoDetectChangesEnabled && !this.ValidateOnSaveEnabled ? 2 : 0)));
}
catch (UpdateException ex)
{
throw this.WrapUpdateException(ex);
}
}


用Resharper看源码,是会抛出异常才对啊,自已加了try/catch



奇怪,我看了数据库时间列虽是不可空,但是有GETDATE()默认值,而且我插入了一行也正常

INSERT INTO    dbo.VerifyCode
( VerifyText, Guid )
VALUES  ( N'1', -- VerifyText - nvarchar(50)
NEWID() -- Guid - uniqueidentifier
)


如果传一个CreateTime进去,是可以保存成功,但SQL语句是不用传时间的呀

CreateTime改成可空后可以了,但不会使用其默认值GETDATE(),而是NULL

有两点明天要再搞清一下

1、为什么SaveChanges()不报错,下断点调试,不往下执行。断点如果放在下一行,就根本到不了

2、数据库中想插入默认数据要怎么办
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